使用拓扑优化算法时遇到的网格设置问题
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老师您好，我在官方案例(https://support.lumerical.com/hc/en-us/articles/1500007188582-Topology-Optimization-of-a-4-channel-wavelength-demultiplexer-2D-TE)中，将原先使用的2D FDTD改为了Var FDTD以期望得到更贴近3D器件结构的参数，我的改动如下：
现代码出现以下报错：
同时我之前对原案例中进行简单的结构参数修改时也会碰到下图所示问题，我想弄清这个问题的原因以及如何设置合适的网格参数？
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