I don't have access to all the different X-Code versions.
The message you get is because lldb returned with a message that the IDE did not expect.
That is because it is possible that diff versions of lldb have differences in the text the output for the same event.
So probably the IDE does not know the text returned in your case.
Despite the error, the IDE should still expect lldb to have paused your app. If lldb did, then you can continue, with stepping or running.