我这个仿真在不放置signal processing模块的时候，跑出来是正常的。但是添加上后，低通滤波器LPF就报错，提示：Derivative input 7 of 'MTPA/LPF' at time 0.0 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)
这两个模块怎么会产生影响呢
