I have the same issue with ts3 and WET on Windows 7. If ts3 is open when I start ET I get the exact same message.

SOLUTION: Start WET, then start ts3 - Both then work fine!

ts3 is treated as a hacking client because it accesses WET files for the overlay to work. I would assue ifire does the same so maybe the same solution will work.
Hope this helps.