Acceleration computation failed to converge after 25 iterations

wen_whu

ERROR:   Time 0.000000E+00:
Acceleration computation failed to converge after 25 iterations.
Equation with the largest imbalance: FxdJnt/37 Z Delta
Imbalance = 1.024000000E+03
Variable receiving largest increment: Part/7 X Acc
Delta = 0.000000000E+00
1) Check mass and inertia properties to ensure they are valid.
2) Make sure the choice of units is appropriate for the system.
   Systems that have very small inertias may benefit from "small"
   force units, e.g., dynes.
3) Check that motion generators are valid and no redundant constraints exist.
4) Check if impact functions caused a strange response in the model (verify properties).
5) An IMPLICIT DIFF element which does not reference DIF1 must be satisfied by its IC.
出现这样的问题该怎么办？