哪位高人，帮忙解释一下warning是什么意思。

ctf

THERE IS ZERO FORCE EVERYWHERE IN THE MODEL BASED ON THE DEFAULT
             CRITERION. PLEASE CHECK THE VALUE OF THE AVERAGE FORCE DURING THE
             CURRENT ITERATION TO VERIFY THAT THE FORCE IS SMALL ENOUGH TO BE
             TREATED AS ZERO. IF NOT, PLEASE USE THE SOLUTION CONTROLS TO RESET
             THE CRITERION FOR ZERO FORCE.