Checklist page error "Failed Ajax request or invalid JSON returned."

PHP version 7.4.19
OJS version

After a successful update from to I am getting the following error.

Failed Ajax request or invalid JSON returned.

PHP Error Lo is
mod_fcgid: stderr: PHP Fatal error: Declaration of SubmissionChecklistForm::initData($args) must be compatible with Form::initData() in …/lib/pkp/controllers/grid/settings/submissionChecklist/form/ on line 41, referer: …index.php/dergi/management/settings/workflow

Does anyone have a similar problem or have a solution suggestion?


My problem was solved as follows:
First, I disabled the second language support. Then I activated it again. Problem solved.

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