Endless running submit button OJS 3.4, cannot save for later too

I created new submission but the submit button keep running

error log shows:

[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 112
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 124
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 135
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 145
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 155
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 165
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 112
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 124
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 135
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 145
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 155
[31-Jan-2024 19:59:59 Asia/Kuala_Lumpur] PHP Deprecated: Return type of Slim\Collection::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/mabjourn/public_html/iabconference/lib/pkp/lib/vendor/slim/slim/Slim/Collection.php on line 165

@asmecher please how do I solve this

Hi @malmal,

Those messages are just warnings; when you encounter a 500 error, as your browser screenshot shows, there should be something more than that. Look for “Error” or “Fatal Error” in your log that appears at the moment you see a 500 error in the browser. It might be a little hard to find if you have lots of deprecation warnings.

Regards,
Alec Smecher
Public Knowledge Project Team