Kethane works fine, until I try to launch. Help please?

[Odo]

Hello, as the title says, kethane mod doesnt work when I try to launch a space craft with any of the mods parts on it. When I hit launch, I get this screen:

Could anyone please tell me whats wrong? I have the newest version of KSP, newest version of the kethane mod, and I'm on a MAC. This is my first time installing a mod, I think I did it right, but I might not have, which is why this might be happening. Please help soon, Im all anxious to get this mod working Thanks.

[RocketPilot573]

The problem is that the "PluginData" folder has moved inside the "plugins" Folder. So move all the files in the old "PluginData" folder to the new one. That's what fixed this issue for me.