Resolving Groovy Business Rule Validation Issues

Hello experts,

I have a problem validating groovy rules using new tool that is able to check if rule is good or not: Groovy Script Validator

I have a rule using this code:

This rule has a call with a TEMPLATE and if I use calcscript variable it works perfectly my template code, but I have an error with Groovy Script Validator.

However, if I create a new variable calcscript, for example, calcscript_Template1 and use inside the TEMPLATE in the Groovy Script validation, I don't get an error in validation but the template doesn't work. What can I do?