各位大侠帮帮忙，看是什么问题

我做的是螺栓法兰的非线性接触分析，前面加在什么的都没有警告，到最后计算的时候不停的出现类似的警告，*** WARNING *** CP = 115.269 TIME= 09:06:19
A reference force value times the tolerance is used by the
Newton-Raphson method for checking convergence. The calculated
reference FORCE CONVERGENCE VALUE = 4.20554934E-10 is less than a
threshold. This threshold defaults to 1.0-2 or is specified as MINREF
on the CNVTOL command. Check results carefully.
*** WARNING *** SUPPRESSED MESSAGE CP = 148.716 TIME= 09:06:37
A reference force value times the tolerance is used by the
Newton-Raphson method for checking convergence. The calculated
reference FORCE CONVERGENCE VALUE = 8.81755648E-11 is less than a
threshold. This threshold defaults to 1.0-2 or is specified as MINREF
on the CNVTOL command. Check results carefully.
这表示是哪里出问题了啊？