NSReceiverEvaluationScriptError:4

I am trying to delete duplicates in my database. Per advice in a forum, I changed my script “find and receive similar contents” from a limit of .9 to 1.0 for exact duplicate.

Not sure exactly how to edit the script, I just typed in my new number, and saved and exited. Now I have run the script several times, and each time it runs through some of the docs, and then stops and gives me this error message: “NSReceiverEvaluationScriptError:4.”

I’m afraid to keep running the script–is there a danger this error will hurt my data? Did I do something wrong in the way I edited the limit in the script?

Thanks.
Emily

Which version of DT Pro do you use? Has been anything logged to the system console?