I KeePass I have the Auto-Type code: {C:Comment}, see also #5333
Currently you show the following message when the syntax of the Auto-Type statement is not correct:

I suggest that you show the invalid part in this message, like:

The following statement in the Auto-Type statement is not correct or not supported:
{C:Felder auf mehreren Seiten}

This way users see what part is not correct/not supported.