Why is my unity app crashing when I start another one? - unity3d

I'm trying to create a multiplayer scene with VR in Unity using a HTC Vive and steamVR. But I can't test my app on a single computer. I do a "build and run" then my app start but when I click on play in the unity interface, the built app crashes. I don't why. I observed that this phenomenon exists when I add the [CameraRig] prefab from the Steam VR plugin which is essential for the VR
Could you help me please ?
Thank you

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I've programmed a virtual reality game for the HTC Vive in Unity. I used Steam VR.
If I play the game on Unity, everything runs perfectly. It runs also perfectly if I build it. But if I copy my build to another computer, nothing's working.
It looks like this:top right corner
Does anyone no how to solve this?.
My Vive is setup correctly and other games are working just fine.
Thank you
Roman
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Since Steam workflow is to launch games from Steam Library,which launch SteamVR automaticly. make sure the SteamVR app is launched before launching your .exe.

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Best regards Niklas Englmeier
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