It looks to me like your using the Hi-Technic motor controller, right? I've no experience with this, but I think that the same rules that apply to MindStorms motors apply to these.
Try this code:
You see, the problem with your original code is that the nMotorRunState doesn't use a number as a condition. If you want to use a number, then just read the encoder value like in my second sample. If you use nMotorRunState, then wait for it to be equal to runStateIdle.
Do either of these work?
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