Probably relevant lines from the pastebin:
9/27/12 7:12:15 AM SIMBL Agent[2755] warning: failed to get scripting definition from /Applications/Electrum.app; it may not be scriptable.
9/27/12 7:12:15 AM [0x0-0xd50d5].org.pythonmac.unspecified.Electrum[3184] Traceback (most recent call last):
9/27/12 7:12:15 AM [0x0-0xd50d5].org.pythonmac.unspecified.Electrum[3184] File "/Applications/Electrum.app/Contents/Resources/__boot__.py", line 309, in <module>
9/27/12 7:12:15 AM [0x0-0xd50d5].org.pythonmac.unspecified.Electrum[3184] _run('electrum.py')
9/27/12 7:12:15 AM [0x0-0xd50d5].org.pythonmac.unspecified.Electrum[3184] File "/Applications/Electrum.app/Contents/Resources/__boot__.py", line 306, in _run
9/27/12 7:12:15 AM [0x0-0xd50d5].org.pythonmac.unspecified.Electrum[3184] execfile(path, globals(), globals())
9/27/12 7:12:15 AM [0x0-0xd50d5].org.pythonmac.unspecified.Electrum[3184] File "/Applications/Electrum.app/Contents/Resources/electrum.py", line 147, in <module>
9/27/12 7:12:15 AM [0x0-0xd50d5].org.pythonmac.unspecified.Electrum[3184] import electrum.gui_lite as gui
9/27/12 7:12:15 AM [0x0-0xd50d5].org.pythonmac.unspecified.Electrum[3184] ImportError: No module named gui_lite
9/27/12 7:12:15 AM Electrum[3184] Electrum Error
I am on linux, but I remember that I had this error message one time. Updating electrum to a newer version fixed it IIRC.
Do you have the newest version?
Here:
https://bitcointalk.org/index.php?topic=100502.msg1144908#msg1144908 someone had this problem and fixed it by updating MacOS.