[Unity 4.5] Missing all scripts in the Plugins folder when I open on another computer - PC <> Mac

Hello,
I’m working on Windows and also OSX.
When I copy and paste the same project to OSX or to Windows all script components are missed.

The referenced script on this Behaviour is missing

All missed scripts are located in the “Plugin” directory.
When I fix this and I copy and paste the fixed project I got the same exact issue in the other computer.

Thanks.

SOLVED!

My github ignored all .meta files in my Plugins folder.
.meta files should not be removed!