In the file "flexform_list.xml" is a group element "settings.xf.xfc_p_icss" with config option "allowed" set to "css". This option is only allowed for tables and leads to an error in this case:
PHP Warning: Undefined array key "css" in typo3/sysext/backend/Classes/Form/FieldWizard/TableList.php line 61
In the file "flexform_list.xml" is a group element "settings.xf.xfc_p_icss" with config option "allowed" set to "css". This option is only allowed for tables and leads to an error in this case:
PHP Warning: Undefined array key "css" in typo3/sysext/backend/Classes/Form/FieldWizard/TableList.php line 61