suddenly Maya won´t work!!!

Please help!! I started my Macpro this morning and after I launched Maya it refuse to open. The script editor says something like this:

// Error: file: /Applications/Autodesk/Maya.app/Contents/scripts/startup/layerEditor.mel line 4132: Could not find attribute named "defaultRenderLayer.precompTemplate" //
// mental ray for Maya 10.0
// mental ray for Maya: using startup file /Applications/Autodesk/Maya.app/Contents/mentalray/maya.rayrc
// mental ray for Maya: setup
// mental ray for Maya: initialize
// mental ray for Maya: using 1 license
// mental ray for Maya: register extensions
// mental ray Node Factory: loaded
// Error: file: /Applications/Autodesk/Maya.app/Contents/scripts/others/miImfkeyOverrideScriptJ ob.mel line 37: No object matches name: renderLayerManager.renderLayerId //
// mental ray for Maya: successfully registered
// mental ray for Maya: loading startup file: /Applications/Autodesk/Maya.app/Contents/mentalray/maya.rayrc
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/AdskShaderSDKWrapper s.mi
// generating Maya nodes...
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/architectural.mi
// loading /Applications/Autodesk/Maya.app/Contents/mentalray/lib/architectural.so
// generating Maya nodes...
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/base.mi
// loading /Applications/Autodesk/Maya.app/Contents/mentalray/lib/base.so
// generating Maya nodes...
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/contour.mi
// loading /Applications/Autodesk/Maya.app/Contents/mentalray/lib/contour.so
// generating Maya nodes...
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/paint.mi
// loading /Applications/Autodesk/Maya.app/Contents/mentalray/lib/paint.so
// generating Maya nodes...
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/physics.mi
// loading /Applications/Autodesk/Maya.app/Contents/mentalray/lib/physics.so
// generating Maya nodes...
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/production.mi
// loading /Applications/Autodesk/Maya.app/Contents/mentalray/lib/production.so
// generating Maya nodes...
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/subsurface.mi
// loading /Applications/Autodesk/Maya.app/Contents/mentalray/lib/subsurface.so
// generating Maya nodes...
// parsing /Applications/Autodesk/Maya.app/Contents/mentalray/include/surfaceSampler.mi
// loading /Applications/Autodesk/Maya.app/Contents/mentalray/lib/surfaceSampler.so
// generating Maya nodes...
updateRendererUI;
// Error: file: /Applications/Autodesk/Maya.app/Contents/scripts/others/mentalrayUI.mel line 1615: Object not found: mainRenderMenu. //

seems the problem is with Mental Ray.

Someone can help me, please????

Thanks a lot!!!