Something is messing with your editor code. Do you know what ‘Spider_Catalog’ might be that is adding something to the tinyMCE editor? Whatever it is it seems to be causing an error.

Thanks ,
 I disabled the Editor TinyMCE Rich Text and running again , I do not know why

oggi provo a capire cosa succede con lo  'Spider_Catalog'

Many WP plugin add-ons to TinyMCE assume that the editor is only used for writing blog posts and pages. But it can be used anywhere including, as with Simple:Press, the public side of your website. The problem is that often the TinyMCE add-on is being always included in the editor even when it is not or should not be loaded and this can cause problems causing the whole editor to shut down.

I
 get it.
I have another problem that I can not solve :
As seen from the attached screenshot counter elapsed time from last post sometimes writes random numbers , and on that occasion when I press the button to reset the list of unread messages , the list goes to 0 but reloading the page back 1 .

Please see this FAQ for the posted time issue: https://simple-press.com/documentation/codex/faq/troubleshooting/why-do-my-new-posts-show-as-posted-minus-seconds-ago/

On the unread posts item – are you a forum admin or moderator and do you place posts in moderation because if so any found to be awaiting approval will force the unread post count to show them.