Have look at this doc, Smart View Errors "EPMHFM-7100: Unspecified DROID Error Occurred" or "EPMHFM-221: Invalid argument" When Member Options Set to "Description Only" (Doc ID 2205077.1)
Also enable the smartview logs and see if you get any additional info there
Yes, Dayalan, you are right! I found this item in user's worksheet:
It seems user used an element description as a string and to do this he added "_" symbol to the end of line. It worked fine in old HFM 2.1, but it seems doesn't work with HFM 2.4. May be new 2.4 release trims all strings before proceed, and it got "Deferred VAT ( the underlying receivables balance is recovered/written off)" string without "_" symbol at end. We have four accounts with this description and if the system try to resolve member description to it's label it catch EPMHFM-221 error.