Issue
When adding more variables to workflow Catalog Task activity, all the variable names are added in a Slush Bucket field. And this Slush Bucket field has max length defined of 4000 characters.
Cause
The "Variables on Task Form" slush bucket is limited to 4000 characters.
Resolution
- Try to remove variables that no longer used to make more space for your new variables.
- Try shorten some long variable names to make more space.