I got this after installing the rendering pipeline core and I searched all over Google and tried so many things, with some fixing it but cause other issues with other scripts. I just want to use the Shadergraph but this error is preventing me from doing so. I am using Unity 2018.2.19f1. And another thing, what is FilterWindow.cs? I got this error as well after installing the rendering pipeline core and I rebooting but no fix.
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