Problem when importing Clause

Hello Experts,

As far as I know to create a Clause you generate 2 files:

1. Caluse

2. Content.

I am having problems when importing the file to create the Clause, I am doing a test and it is failing the file looks as next:

When I try tu upload I get the next error.

# Failed: object 1: Error executing script: Sourced file: inline evaluation of: ``import com.sap.eso.api.contractgen.*; import com.sap.eso.api.contractgen.phase. . . . '' : null. [STANDARD_ATTRIBUTE_ID].

I have no idea what does that mean if I am filling all the fields what is the STANDARD_ATTRIBUTE_ID, any idea why am I getting this error?

Thank you for the answers.

Best Regards.