[SOLVED] Fatal error since this morning

Hi,  since this morning I can't start phpstorm any more. I get a fatal error, and I see this in logs : 2012-08-30 07:48:48,735 [  50784]  ERROR - plication.impl.ApplicationImpl - Unknown constant tag 0 in class file org/jetbrains/yaml/psi/impl/YAMLPsiElementImpl  I tried to remove my .WebIde40 folder, but I'm still having the error.  Can you help me ? Thanks Laurent