An unexpected error has occurred

I get the following error when going into Submissions tab. The error flashes away after a second or two without clicking on OK.

OJS: 3.1.0-1 (upgraded from 2.4), PHP: 5.6

2018-02-22%20(2)

Unfortunately it is not repetable, But here is the output from the log when doing the same thing error_reporting = E_ALL :
[22-Feb-2018 15:11:24 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getSeq() should be compatible with BlockPlugin::getSeq($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:24 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:24 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getEnabled() should be compatible with BlockPlugin::getEnabled($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:24 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getContents() should be compatible with BlockPlugin::getContents($templateMgr, $request = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:28 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getSeq() should be compatible with BlockPlugin::getSeq($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:28 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:28 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getEnabled() should be compatible with BlockPlugin::getEnabled($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:28 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getContents() should be compatible with BlockPlugin::getContents($templateMgr, $request = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:30 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getSeq() should be compatible with BlockPlugin::getSeq($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:30 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:30 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getEnabled() should be compatible with BlockPlugin::getEnabled($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:30 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getContents() should be compatible with BlockPlugin::getContents($templateMgr, $request = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:31 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getSeq() should be compatible with BlockPlugin::getSeq($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:31 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:31 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getEnabled() should be compatible with BlockPlugin::getEnabled($contextId = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134
[22-Feb-2018 15:11:31 Europe/Belgrade] PHP Strict Standards: Declaration of CustomBlockPlugin::getContents() should be compatible with BlockPlugin::getContents($templateMgr, $request = NULL) in C:\inetpub\wwwroot\plugins\generic\customBlockManager\CustomBlockPlugin.inc.php on line 134

I have read other threads about this issue, but I don’t get what’s wrong.

Best regards,

Edvin

Anyone who has any ideas?

did you found any solution?

No!
We believe that it is a Windows server problem. We are about to transfer to linux soon. Maybe that solves the problem - I am not sure…

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