Automatically getting error in project when I open it in eclipse

I'm getting an error everytime i try to open a project that doesn't have any.

I get these error messages in the console section of eclipse:

[2011-07-21 19:17:54 - Dex Loader] Unable to execute dex: wrapper was not properly loaded first
[2011-07-21 19:17:54 - Sound Board Template] Conversion to Dalvik format failed: Unable to execute dex: wrapper was not prop开发者_如何转开发erly loaded first

Any ideas?

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Have you tried re-installing the android SDK?