I have the configuration per definition of jenkins.txt.

I took the following script which was already approved as a parameter in active choice:

return [ 'betops_t3,sfils,ozs_suzocfopzef': 'ozs', 'msszef,zls,mcs_bqwr': 'mcs_bqwr'] 

And add it as id=Repository_data.groovy, Name=Repository Data, no checkbox were selected. The script is approved.

At an existing "Active Choices Parameter" I switch from Groovy Script to Scriptler Script and get the message:

No scripts are defined. Please define one at scriptler

And it doesn't matter what the value of Use Groovy Sandbox.