Greetings to all,
I tried downgrade on older version WordPress (5.2.6 – tested version for plugin), and then I tried uninstalled and again installed OptionTree plugin too but it didn’t work. Finally, I asked web hosting service restored my web page and database from backup and problem with OptionTrees plugin is solved for this time.
I don’t know what the problem caused, maybe some random mistake. Today after restored web page from backup works everything with newest WordPress version (5.4.1).
Regards and good luck
Pavel
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This reply was modified 4 years, 6 months ago by Pavel.