求助PKPM一个计算问题run-time error M6201: MATH

各位大侠，在用PKPM计算地基梁时，在计算分析那一步，出现这个问题，程序中断，换别人的机子来算也会出现这问题，重新建模也出现，到底怎么办。我被搞疯了。求助求助，感激万分！
run-time error M6201: MATH
- sqrt: DOMAIN error
Image PC Routine Line Source
OPTLIB.DLL 1F80ABA9 Unknown Unknown Unknown
OPTLIB.DLL 1F80AA07 Unknown Unknown Unknown
OPTLIB.DLL 1F80AB61 Unknown Unknown Unknown
OPTLIB.DLL 1F804BA8 Unknown Unknown Unknown
OPTLIB.DLL 1F82E970 Unknown Unknown Unknown
OPTLIB.DLL 1F828CE0 Unknown Unknown Unknown
OPTLIB.DLL 1F822998 Unknown Unknown Unknown
OPTLIB.DLL 1FA047D9 CAL_WEIGHT 1050 P111.for
OPTLIB.DLL 1FAA1077 DLWDCPT 77 P115.for
OPTLIB.DLL 1FA1EED2 CALCULATE 281 Pk11.for
OPTLIB.DLL 1FA1E9D3 PK_MAIN 100 Pk11.for
OPTLIB.DLL 1F7E4DC3 CON_PK_CALCULATE 54 OptLibIn.f90
OPTLIB.DLL 1F7F4ECE Unknown Unknown Unknown
wxlCmdMngr.dll 7A101C0E Unknown Unknown Unknown
wxlCmdMngr.dll 7A10586F Unknown Unknown Unknown
PKEXEMANAGE.EXE 00410304 Unknown Unknown Unknown
PKSRW.DLL 1A0076FE Unknown Unknown Unknown
PKSRW.DLL 1A005868 Unknown Unknown Unknown
PKSRW.DLL 1A005706 Unknown Unknown Unknown
wxlCmdMngr.dll 7A1025F1 Unknown Unknown Unknown