"All compiler errors have to be fixed before you can enter playmode" in a VRChat avatar project

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What you see on screen:

What it means

A script somewhere in the project has a red error, so you can't enter Play mode or upload. This message itself is not the cause - the real error is elsewhere in the Console.

Common causes

• A required package (VRChat SDK, Modular Avatar, lilToon, etc.) is not installed
• A package version doesn't match what the avatar or outfit requires
• An old SDK left in the Assets folder is conflicting with the new one

How to fix it

1. Open the Console, press Clear, and read the first red error that remains
2. Install or update the package named in the error (VRC, nadena, lilToon, etc.) using VCC (VRChat Creator Companion) or ALCOM
3. If an old SDK folder such as Assets/VRCSDK is still there, back up the project and delete it

Before you change anything, make a full copy of your project folder so you can go back.

Related errors

• "The type or namespace name 'VRC' could not be found" (CS0246)
• Missing Script on a VRChat avatar ("The referenced script on this Behaviour is missing")
• "Failed to resolve packages" in a VRChat project (VCC / ALCOM)
• Modular Avatar (nadena.dev) errors in VRChat

See other errors