When we get the above error while launching the Admin console and expanding the groups in the BizTalk server Application, we can refer the following links to resolve it.
If still the issue does not get resolved, try deleting the Microsoft.BizTalk.Administration.SnapIn.dll.config from Current user, \<USER>\AppData\Local\Microsoft Corporation\Microsoft BizTalk Server folder . This folder is generally hidden.
We can also try collecting the BizTalk traces for further analysis of the root cause.
