Export stl files with C# component in GH

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I guess this is related to this:

Grasshopper becomes uncontrollable when I use export stl component

Hello, I tried to implement STL export component, and it works by referring to this topic(Export stl files with C# component in GH). But after export STL, I cannot control grasshopper except scaling with a wheel. This uncontrollable situation occurs sometimes beside this component too. How can this be solved? Thanks