Mac OS X Java megazoomer: no matching architecture in universal wrapper
Anything in /Library/Application Support/SIMBL/Plugins has been installed after SIMBL which is is a way of injecting code into a Cocoa app using an Input Manager. SIMBL is a third party add in, the link to megazoomer from the SIMBL page gives a Not found so I would assue it is not maintained.

I would guess the actual error is that megaxoomer does not have a 64 bit Intel version.

Unless you want the extra functions of megazoomer I would delete all the SIMBL plugins ie delete /Library/Application Support/SIMBL and unsinstall SIMBL as per SIMBL docs. 


  You can run the SIMBL Uninstaller app included with the installer.


Basically unless you know exactly what you are running SIMBL for I would uninstall it.