[At least J3.8+ recommended] J3.7.5 and FC 3.3.x Call to a member function setNewTags() on null when trying to edit an article

hi all we have joomla 3.7.5 and after the update of flexicontent 3.2.1.14 to latest 3.3.1.5 we cant get to edit an article because we get this error"0 Call to a member function setNewTags() on null".

in tags-maintance-verify tags mapping we have done it but these didnt resolv the problem.We have also disabled tags but still no luck.
other data is mysql 5.7.19 and php 7.0.22

hello at first update your joomla to 3.9.4!!! and retry

hi can i avoid this step as it will ruin all my custom work with templates and other modules.Can i downgrade to previews version of flexi that was working?

yes you can try too downgrad
new tag system synchronisation need current joomla

ok i will need to just to upload the old zip of flexicontent?

Hello

Do NOT uninstall you will delete the data tables

To downgrade you can just upload the old file 3.2.1.15 via the Joomla installer

Note: Unfortunately, every time you login to backend you will be asked to update the DB table indexes once
but this will happen just once per login