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lonely boylonely boy 

I have one flow variable ValidationError and in class as well.I was getting below error when I was creating or updating the case record.Please help me

We can't launch this flow because of a variable error. Send this error message to your admin. The value null is being provided for variable validationError but isn't compatible with the variable's data type (String). Check the places where you implemented the flow ‒ such as through a Lightning page or a custom button ‒ and make sure that all provided values are compatible with the variables' data types