During test on live server, we are experiencing an issue in OJS 3.5.0-3 where we are unable to edit an existing issue from the Issue Management interface.
When attempting to edit an issue, OJS displays:
“An unexpected error has occurred. Please reload the page and try again.”
Upon checking the PHP error logs, we observe the following fatal error:
PHP Fatal error: Uncaught TypeError: flock(): Argument #1 ($stream) must be of type resource, false given in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/LockableFile.php:153
Stack trace:
#0 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/LockableFile.php(153): flock()
#1 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Cache/FileStore.php(111): Illuminate\Filesystem\LockableFile->getExclusiveLock()
#2 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Cache/FileLock.php(14): Illuminate\Cache\FileStore->add()
#3 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Cache/Lock.php(91): Illuminate\Cache\FileLock->acquire()
#4 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Console/Scheduling/CacheEventMutex.php(66): Illuminate\Cache\Lock->get()
#5 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Console/Scheduling/ManagesAttributes.php(152): Illuminate\Console\Scheduling\CacheEventMutex->exists()
#6 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(36): Illuminate\Console\Scheduling\Event->Illuminate\Console\Scheduling\{closure}()
#7 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Util.php(43): Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
#8 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(83): Illuminate\Container\Util::unwrapIfClosure()
#9 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(35): Illuminate\Container\BoundMethod::callBoundMethod()
#10 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(696): Illuminate\Container\BoundMethod::call()
#11 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Console/Scheduling/Event.php(334): Illuminate\Container\Container->call()
#12 /ojs3503/lib/pkp/classes/scheduledTask/ScheduleTaskRunner.php(65): Illuminate\Console\Scheduling\Event->filtersPass()
#13 /ojs3503/lib/pkp/classes/scheduledTask/PKPScheduler.php(152): PKP\scheduledTask\ScheduleTaskRunner->run()
#14 /ojs3503/lib/pkp/classes/core/ScheduleServiceProvider.php(88): PKP\scheduledTask\PKPScheduler->runWebBasedScheduleTaskRunner()
#15 [internal function]: PKP\core\ScheduleServiceProvider->PKP\core\{closure}()
#16 {main}
thrown in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/LockableFile.php on line 153
[25-Feb-2026 16:10:11 Asia/Kolkata] PHP Warning: file_put_contents(/ojs3503/cache/opcache/a7/95/a7953448c57d6989f68a76d8dd234f06ec076721): Failed to open stream: Permission denied in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 16:10:11 Asia/Kolkata] PHP Warning: file_put_contents(/ojs3503/cache/opcache/a7/95/a7953448c57d6989f68a76d8dd234f06ec076721): Failed to open stream: Permission denied in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 16:10:11 Asia/Kolkata] PHP Warning: file_put_contents(/ojs3503/cache/opcache/1f/c3/1fc3c933801590c2aec8331b065c7b6fc15e40d6): Failed to open stream: Permission denied in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 16:10:11 Asia/Kolkata] PHP Warning: file_put_contents(/ojs3503/cache/opcache/1f/c3/1fc3c933801590c2aec8331b065c7b6fc15e40d6): Failed to open stream: Permission denied in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/47/b4/47b4e7f457be38d8bda76e113d40ee310871946c): Failed to open stream: Permission denied in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/2d/db/2ddb7fef054d189dbc17d9862fccff922c94fc57): Failed to open stream: Permission denied in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/47/b4/47b4e7f457be38d8bda76e113d40ee310871946c): Failed to open stream: Permission denied in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/2d/db/2ddb7fef054d189dbc17d9862fccff922c94fc57): Failed to open stream: Permission denied in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/21/50/21506f8942223f69ec498ceba4282adece89b334): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/21/50/21506f8942223f69ec498ceba4282adece89b334): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/21/50/21506f8942223f69ec498ceba4282adece89b334): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/21/50/21506f8942223f69ec498ceba4282adece89b334): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/fe/04/fe040d1f3fa183e857ee5b481e43a4f87f55f7ca): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/fe/04/fe040d1f3fa183e857ee5b481e43a4f87f55f7ca): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/21/50/21506f8942223f69ec498ceba4282adece89b334): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/21/50/21506f8942223f69ec498ceba4282adece89b334): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/21/50/21506f8942223f69ec498ceba4282adece89b334): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/21/50/21506f8942223f69ec498ceba4282adece89b334): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/fe/04/fe040d1f3fa183e857ee5b481e43a4f87f55f7ca): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/fe/04/fe040d1f3fa183e857ee5b481e43a4f87f55f7ca): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3e/72/3e72b9a23b5a53f4ac5fa9f6d96f06de9f1c5f62): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3e/72/3e72b9a23b5a53f4ac5fa9f6d96f06de9f1c5f62): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/aa/d8/aad89ddb2b453f843145759cf87fe43a3e4da1aa): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/aa/d8/aad89ddb2b453f843145759cf87fe43a3e4da1aa): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3b/c2/3bc23116e808a2a24c140386cceb437d0d9ebc38): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3b/c2/3bc23116e808a2a24c140386cceb437d0d9ebc38): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3e/72/3e72b9a23b5a53f4ac5fa9f6d96f06de9f1c5f62): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3e/72/3e72b9a23b5a53f4ac5fa9f6d96f06de9f1c5f62): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/aa/d8/aad89ddb2b453f843145759cf87fe43a3e4da1aa): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/aa/d8/aad89ddb2b453f843145759cf87fe43a3e4da1aa): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3b/c2/3bc23116e808a2a24c140386cceb437d0d9ebc38): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3b/c2/3bc23116e808a2a24c140386cceb437d0d9ebc38): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3d/c1/3dc15e6a90472ce5ba1e3e9ad38eb172764f183b): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:11 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/3d/c1/3dc15e6a90472ce5ba1e3e9ad38eb172764f183b): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/6d/0a/6d0a6d589633d5b3d001c6738cb0d839ed64685e): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/71/8a/718ae67ac811a589edf4867f5eb8d5ffb59b2ee8): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/a0/5a/a05a04103b1b2631e624e2cb047e13f1e76851a6): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/4d/bc/4dbc0ce8ab0a679532271d96a203dafaae6e24df): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: fopen(/ojs3503/cache/opcache/f1/d0/f1d023de2d739c7f72fdd63066213d9814d752d6): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/LockableFile.php on line 69
[25-Feb-2026 10:40:12 UTC] PHP Fatal error: Uncaught TypeError: flock(): Argument #1 ($stream) must be of type resource, false given in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/LockableFile.php:153
Stack trace:
#0 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/LockableFile.php(153): flock()
#1 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Cache/FileStore.php(111): Illuminate\Filesystem\LockableFile->getExclusiveLock()
#2 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Cache/FileLock.php(14): Illuminate\Cache\FileStore->add()
#3 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Cache/Lock.php(91): Illuminate\Cache\FileLock->acquire()
#4 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Console/Scheduling/CacheEventMutex.php(66): Illuminate\Cache\Lock->get()
#5 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Console/Scheduling/ManagesAttributes.php(152): Illuminate\Console\Scheduling\CacheEventMutex->exists()
#6 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(36): Illuminate\Console\Scheduling\Event->Illuminate\Console\Scheduling\{closure}()
#7 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Util.php(43): Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
#8 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(83): Illuminate\Container\Util::unwrapIfClosure()
#9 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(35): Illuminate\Container\BoundMethod::callBoundMethod()
#10 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(696): Illuminate\Container\BoundMethod::call()
#11 /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Console/Scheduling/Event.php(334): Illuminate\Container\Container->call()
#12 /ojs3503/lib/pkp/classes/scheduledTask/ScheduleTaskRunner.php(65): Illuminate\Console\Scheduling\Event->filtersPass()
#13 /ojs3503/lib/pkp/classes/scheduledTask/PKPScheduler.php(152): PKP\scheduledTask\ScheduleTaskRunner->run()
#14 /ojs3503/lib/pkp/classes/core/ScheduleServiceProvider.php(88): PKP\scheduledTask\PKPScheduler->runWebBasedScheduleTaskRunner()
#15 [internal function]: PKP\core\ScheduleServiceProvider->PKP\core\{closure}()
#16 {main}
thrown in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/LockableFile.php on line 153
[25-Feb-2026 10:40:12 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/6d/0a/6d0a6d589633d5b3d001c6738cb0d839ed64685e): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/71/8a/718ae67ac811a589edf4867f5eb8d5ffb59b2ee8): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/a0/5a/a05a04103b1b2631e624e2cb047e13f1e76851a6): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: file_put_contents(/ojs3503/cache/opcache/4d/bc/4dbc0ce8ab0a679532271d96a203dafaae6e24df): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php on line 204
[25-Feb-2026 10:40:12 UTC] PHP Warning: fopen(/ojs3503/cache/opcache/f1/d0/f1d023de2d739c7f72fdd63066213d9814d752d6): Failed to open stream: No such file or directory in /ojs3503/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Filesystem/LockableFile.php on line 69
