请问MRCC中如何添加溶剂

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请问，如何在MINP添加溶剂的关键词，我是想在算分子的能级时考虑溶剂效应，我查看了手册，试了直接加pcm=methylenechloride，会有这样的报错：
Initializing PCM calculation...
PCMSolver warning.
In function computeS at line 51 of file /home/kallay/MRCC/PUB/pcmsolver-1.3.0/src/bi_operators/IBoundaryIntegralOperator.cpp
S matrix is not positive-definite!
Consider changing the average area of the cavity finite elements.
其中提到'考虑改变腔有限元的平均面积'意思是我要自己去加一个腔吗，希望大家能指点一下，感谢！