I've tried reinstalling Mechjeb, both the official and dev release, multiple times and all I get is this:
https://drive.google.com/file/d/1WYSpB7jS5os9B6Zk-M4vJ5RCwjATmAKg/view?usp=sharing
Please can anyone help? the .dll is in the right place but for some reason still isn't working and I just don't understand what I'm doing wrong.