arcame As apparently seen, The issue relates to K2 component error which is being shown when opening specific module in module manager. K2 component might have been installed in the past and not removed correctly
In initial stage, The specific module is configured to pull data from k2 categories
You may try the solution provided here and try remove all the references manually through ftp client for K2 component
Kindly ensure to take backup of your site before performing this step so as to rollback in case required
