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I do still have this error today on 2017 1.0f3, however the error doesnt seem to have influence on my project in any way.
Oh your totally right, i changed it to 2D and used Collider2D instead of Collider as Paramtere, that fixed it. Thanks !
So i have a player that fires bullets (prefabs) and i have an enemy, that should get damage. The Problem is, that it doesnt detect the collision...