[wp-trac] [WordPress Trac] #54991: Site problem

[WordPress Trac]

#54991: Site problem
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 Reporter:  nikosgr74     |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:  5.9
 Severity:  critical      |  Resolution:
 Keywords:                |     Focuses:
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Comment (by multidots1896):

 Hi @nikosgr74

 Can you please check plugin updation or affecting any plugin to your site.
 visit your WordPress Admin Dashboard --> Plugins page. Then deactivate
 each plugin one by one. Make sure you check after deactivating each
 plugin, so that you would be able to figure out which plugin is causing
 the issue. While you are deactivating the plugins, if the warning
 disappeared, you would be able to tell that the plugin that you just
 deactivated is the affecting here.

 also refer this below links it might be helpful for you.
 [https://stackoverflow.com/questions/66433518/warning-call-user-func-
 array-expects-parameter-1-to-be-a-valid-callback]
 [https://wordpress.stackexchange.com/questions/108860/error-call-user-
 func-array-expects-parameter-1-to-be-a-valid-callback]

 Thanks

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Ticket URL: <https://core.trac.wordpress.org/ticket/54991#comment:2>
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