Has anyone encountered this error before?

{
  "type": "error.SuiteScriptModuleLoaderError",
  "name": "UNEXPECTED_ERROR",
  "message": "",
  "stack": []
}

It comes from a script that processes data uploaded to a custom record... generating customer refunds from it. And there are no rows to be processed now. Note: I am not using any modules other than standard ones.

what does the script look like