Does anybody knows what does it mean and what needs to be done to fix the problem?
Try to rotate part until the center of gravity will be vertically aligned with the point of impact.
I am new to drop test studies but as far as I have learned this error means your solution is not converging i.e energy is not being damped or converted to other forms which should usually happen when you drop an object. I suggest trying a higher mesh density and specifying friction, damping coefficients where ever required.
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