I have to start with the obvious...
What does 'netstat -a |grep 7890' give you? Is it possible that another copy of the script is running, using that port? The 'address in use' error is pretty straightforward usually.
On a side note, if you didn't already know, running a script (permanently) out of /tmp can be dangerous... some systems have a built-in cron job that deletes anything 7 days old (or less, depending on the system) that is in /tmp. I figure you're just testing now though, but wanted to mention nevertheless.
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