MechJeb Embedded Universal Mod is a hard mod, if you are not a good player, you should choose Career mode support! To solve this problem you must Open folder “Career mode” if you want career mode support, you’ll have to go to R&D to unlock modules. This version uses ModuleManager (included 2.6.5) to provide functionality. Unlike my previous release, it does not change your files, it just appends the MechJeb core at the time of execution.
This does not add MechJeb functionality, it just adds the MechJeb module to the command modules. That means that you don’t have to manually add MechJeb while building your ship, it will come embedded on the command module (not physically, but in the code).
I take no responsibility for what you do to your game.
I have no relation to the guys behind MechJeb nor Module Manager, I would like to say thanks to them, and guys, keep up the good job!