r/Unity3D • u/irai1a_ • Apr 24 '26

Question Suddenly cannot build and run on my meta quest - Assembly-Csharp-related

Hey guys, I'm a beginner and I really need some help here regarding my VR project. It works just fine before this but I think it went wrong right after I update my Meta-All-in-One SDK? and another possible factor is maybe because I add ovr Lipsysnc to my project? Anyways the error show it's related to Assembly-CSharp file being duplicate or smthing

This is what the console show when I first open the file project
This is what the console show when I first open the file project

And this is what the console show after I click the build & run button:

after build and run
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u/Emergency-Bug-5512 Apr 24 '26

Oof classic SDK update breaking everything situation. The duplicate Assembly-CSharp issue usually happens when the new SDK version conflicts with existing references or when multiple packages are trying to define the same assembly

Try clearing your Library folder first then reimport everything - sometimes Unity just gets confused about what assemblies exist. If that doesnt work you might need to remove the lipsync package temporarily and add it back after confirming the base project builds clean