请教建模问题，谢谢。
计算总提示这个怎么办？快疯了。我已经勾上Allow Rigid Body Mode了。
*** STOP: NUMBER OF RIGID BODY MODES WITH ADDITIONAL RIGID-BODY MODE SHIFT = 4
NUMBER OF RIGID BODY MODES WITHOUT ADDITIONAL RIGID-BODY MODE SHIFT = 3
CHECK FOR STRUCTURAL RIGID BODY MODES (WITHOUT THE EFFECTS OF THE FLUID)
*** ERROR NO. A1611 ***
Frequency-no eigenvalue computed,check for rigid body without fluid effects
1PROGRAM ADINA - VERSION 8.3.1 (build 03.02.2006) *** NO HEADING DEFINED ***
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