There seems to be a DataONTAP version syntax that the VSC 4.2 is looking for. I've installed the VSC and tried to modify the credentials for the controllers running an N-Series 7-mode installation (8.1.2P1) and get an error stating "The call failed on the server; see server....". The VSC logs print out a message stating "unknown exception. For input string: '2P1'". More output from the VSC logs are below.
Thanks for trying the beta and bringing this to our attention.
This was identified early on in the beta as an unfortunate regression (see similar threads here in the community) and has been scoped, and the fix is in the works, and will be fixed by the time VSC goes GA.
I hope this doesn't discourage you from trying other areas of the VSC Beta, as we really value this kind of feedback (you can never tell us too much!) Unfortunately, the other areas may not work well with this particular controller due to this issue (it's related to parsing Data ONTAP versions).
Would love to hear if you have other controllers and how they and other areas of VSC are working as well!