The Python utility for creating temporary files is failing unexpectedly. Results cannot be passed to the graphic display.
Try rebooting the machine; you might have hung Python processes. Make sure you have write access to the system temp directory and that the disk is not full. Run another script tool to make sure that this is not a Python installation issue. If you have trouble running all script tools, the Python installation may be corrupt. Uninstall and then reinstall Python. ESRI Technical Support can help you reinstall Python if this seems to be the issue.