trying to open modpacks and they crash

[sheldon0421]

Launcher Version: newest

Operating System: mac OS X 10.8.4

Java Version: Java7 Update 21

Antivirus Program:

Description of Problem:

when I try to open any mod pack it starts starting up then it crashes and goes away.

Error Messages:

Error Log:

[Vivacity]

Launcher Version: newest

Operating System: mac OS X 10.8.4

Java Version: Java7 Update 21

Antivirus Program:

Description of Problem:

when I try to open any mod pack it starts starting up then it crashes and goes away.

Error Messages:

Error Log:

Have you made any changes to the mods files? Optifine, Texture Pack, etc.