关于点焊单元求助

*** USER FATAL MESSAGE 7550 (MDG4SW) FOR PWELD ENTRY ID= 73, THE DIAMETER OF THE SPOT WELD IS NOT GREATER THAN ZERO.
USER INFORMATION: IF BEHV=FF OR FR, THEN THE DIAMETER MUST BE SPECIFIED.
我使用的点焊单元面板 如下。为什么还会出现上述的报错啊。