Aerolite103 meaon point out of range

I installed the Aerilite 103, but it cannot fligh because the maeanpoint is far out of the allowed range.
Too far to the nose.
If I set the weight of the pilot to 0 pound, it seams to be ok.
But when I start a flight, it seams to set the weight back to the original and the plane cannot be rolled
to start.
Even if I start the flight in the air, the plan cannot be controlled an clashes to the ground.
What do I have to do to set the meanpoint correctly?