I have a simple use case but I do not succeed in getting it work:
How can I reset a string form value using the expression form property? I have a string form variable named "nope". I tried to use ${execution.setVariable('nope', '')} in the Expression property but I get the following error: Cannot set value of a non-lvalue expression 'execution.setVariable('nope', '')'
When executing this in a Skript Task, it works fine. When trying to execute this in the "Expression"-field of a form property, this error occurs. I solved it by using a skript task.