Bug WebGL errors after build - Suspected: System.Drawing.Image.FromStream(Byte[])

Hey all,
I have some problems about System.Drawing after building the WebGL.
I have tried some ways, but still not working.
https://forum.unity.com/threads/sys...orks-in-editor-not-build.531324/#post-4810679 This post I have tried, but still confusing. Can anyone explain about csc.rsp?
Can anyone some ideas?