生成mnf文件的时候出错

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The number of modes expected(18)does not match the number found(15). most likely ,the model has eroors or there were more modes requested than exist, please review the prior modal solution for warnings.

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模型挺简单的，就一个零件，但是这个模型是类似弹簧的。我认为模型应该是没错的。