You have installed extension packages (MKPs) that contain CEE plugins. Remove the directory $OMD_ROOT/local/lib/check_mk/base/cee and all files in $OMD_ROOT/local/share/check_mk/web/plugins/wato/ that reference the CEE.
You have installed extension packages (MKPs) that contain CEE plugins. Remove the directory $OMD_ROOT/local/lib/check_mk/base/cee and all files in $OMD_ROOT/local/share/check_mk/web/plugins/wato/ that reference the CEE.