It means you have an invalid program key file and that you need to contact FXHome
I'd try re-downloading your key from the Downloads tab at the top of the screen, and then select My Programs and Keys.
If Effectslab doesn't work properly after re-downloading the key, then it would probably be best to get in touch with the team directly. Giving them a step by step account of how you come across this error and anything significant you may have done prior to the error appearing (such as moving folders around, re-installing or updating effectslab etc).
Hope that helps,