Does this error occur during the bolt pretension step?
Is Plasticity defined for the bolt material with a zero Tangent Modulus?
If so, use the bolt diameter to calculate the bolt area A in square mm.
Calculate the stress in MPa using F/A where F = 20106 N
Compare that stress with the Yield Strength of the bolt material in MPa.
If the stress is larger than the Yield Strength, that is the cause of this error.