There's a couple of posts on this issue in Superzap's upgrade thread. Basically what you have to do is kill one of the xPlusz processes and then turn off nfs. Enter the command:
at the bash prompt and look for the line that calls out xPlusz. There is a number in one of the leftmost columns that gives an ID to the process. At the bash prompt, type in
where xxx is the number that corresponds to the xPlusz process. If you have nfs running then you'll need to turn it off by entering the following in the call waiting prefix or by using the xp command at the bash prompt:
This should get rid of the error message and allow xPlusz to function normally.
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