I'm attempting to post a new mod to Steam using the uploader tool but all of a sudden I get an error message. The error occurs when I select a Mod Package. This is the first time I have experienced this. What I have done so far in an attempt to resolve the issue: I have rebooted my pc. Uninstalled and reinstalled the development tools. Logged in and out of Steam. Verified the SDK files uninstalled and reinstalled Visual Studio 2010 Anyone have any ideas?