请教一个列车模型的问题
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各位大神，小弟建了一个列车模型，在preload时，出现如下的错误：
ERROR: Cannot determine nominal rail offset of Rail-Wheel Pair
$S_BF_F.$S_WS_F.$RWP_Right.
ret = 1
Please try again with better initial values.
WARNING: Warning: Rail-Wheel Pair has no active contact patch.
Using nominal wheel radius for rot. velocity calculation.
Ensure that each Rail-Wheel Pair has exactly one contact patch,
for example by calculating Preloads.
有大神知道是什么原因吗？
ERROR: Cannot determine nominal rail offset of Rail-Wheel Pair
$S_BF_F.$S_WS_F.$RWP_Right.
ret = 1
Please try again with better initial values.
WARNING: Warning: Rail-Wheel Pair has no active contact patch.
Using nominal wheel radius for rot. velocity calculation.
Ensure that each Rail-Wheel Pair has exactly one contact patch,
for example by calculating Preloads.
有大神知道是什么原因吗？
![[免费案例]Ensight案例教程分享](https://img.jishulink.com/cimage/245b3ca9e2c939e40491a25edae94515.jpeg?image_process=resize,fw_576,fh_320,)
把模型发出来看看啊，光说这个谁知道