OJS 3.4.0.4 Error when click Next Pages in Submissions

**Error “An unexpected error has occurred. Please reload the page and try again.” when click Next Pages or using Filters mode with stages “Review” in Submissions active **

I use OJS 3.4.0.4 for our journal. It works fine but yesterday when I click Next Pages or using Filters mode with stages “Review” in Submissions active, the page show popup with notification “Error An unexpected error has occurred. Please reload the page and try again.”

Error log:
[Wed Jun 12 05:09:15.690948 2024] [lsapi:error] [pid 23880:tid 139753371199232] [remote 14.177.95.91:56138] [host jca.edu.vn] Backend fatal error: PHP Fatal error: Uncaught ReflectionException: Class “APP\submission\Collector” does not exist in /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php:889\nStack trace:\n#0 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(889): ReflectionClass->__construct()\n#1 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(770): Illuminate\Container\Container->build()\n#2 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Container/Container.php(706): Illuminate\Container\Container->resolve()\n#3 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php(120): Illuminate\Container\Container->make()\n#4 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/submission/Repository.php(93): app()\n#5

[Fri Jun 14 12:36:50.093309 2024] [lsapi:error] [pid 12194:tid 139753468118784] [remote 69.171.230.113:35732] [host jca.edu.vn] Backend fatal error: PHP Fatal error: Uncaught TypeError: PKP\user\Repository::getByUsername(): Argument #1 ($username) must be of type string, null given, called in /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/security/Validation.php on line 60 and defined in /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/user/Repository.php:78\nStack trace:\n#0 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/security/Validation.php(60): PKP\user\Repository->getByUsername()\n#1 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/pages/login/LoginHandler.php(146): PKP\security\Validation::login()\n#2 [internal function]: PKP\pages\login\LoginHandler->signIn()\n#3 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/core/PKPRouter.php(334): call_user_func()\n#4 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/core/PKPPageRouter.php(277): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest()\n#5 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route()\n#6 /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch()\n#7 /home2/jcaed385/domains/jca.edu.vn/public_html/index.php(21): PKP\core\PKPApplication->execute()\n#8 {main}\n thrown in /home2/jcaed385/domains/jca.edu.vn/public_html/lib/pkp/classes/user/Repository.php on line 78\n
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Inspect Page show:
jquery.min.js?v=3.4.0.4:2
GET https://jca.edu.vn/index.php/jca/api/v1/_submissions?status=1&searchPhrase=&count=30&offset=30&_=1718342961851 500 (Internal Server Error)

Steps I took leading up to the issue
For example:

  1. Go to ‘Submissions’
  2. Click on ‘Nextpage’ in Active tab
  3. See error: An unexpected error has occurred. Please reload the page and try again

Please help me. Thank you so much


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