I get something like this too:
What you could do is find the RPC ID in the web socket log:
In my case it is the GetAppLayout call. The error is 'Request aborted', which the client should handle (and handles) by reissuing the same call (id 4), so everything is OK.
Seems like the client framework looses track of the original call, but there is no real problem, only an annoying error message.
Hope this helps