I'm necroing this post because it's the only one I can find on the topic. A friend and I are having the same problem, we've both got fresh 1.16 installs from Impulse, we tried uninstalling and reinstalling, etc etc. It is not a mesh file error. This happens to us with Ironclad Online and when using a LAN simulator.
Error:
http://img195.imageshack.us/img195/7335/80100851.jpg
did you make sure to manually delete all the files left over after the uninstall? I had the mesh file error and that also didn't help me. I'm still not quite sure what I did different so that it worked. maybe do a reboot of your system between uninstall and reinstall. windows is always a little bitch, you know?
I guess asking to delete mods or the like is redundant with fresh installs and the like ...