Can't add place

I'm using Joomla3 and latest gmapfp and tried to add a place in administrator with php8.0 and php8.1 with the same result when trying to add a place,An error has occurred.

0 Non-static method GMapFPsHelper::saveGMapFPPrep() cannot be called statically
 

I'm also trying to add from frontend and get this error:

0 - Undefined constant "itemid"