VRChat "VRCExpressionsMenu uses a parameter that is not defined" - fix
Quick fix
- Open the Expressions Menu (and its submenus) and check each item
- Register the parameter in Expression Parameters, or delete the menu item
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What you see on screen:
VRCExpressionsMenu uses a parameter that is not defined. Parameter: …
What it means
An item in your Expressions Menu uses a parameter that isn't registered in Expression Parameters.
Common causes
- A gimmick was removed but its menu item stayed
- An outfit menu was added without adding its parameters
How to fix it
- Open the Expressions Menu (and its submenus) and check each item
- Register the parameter in Expression Parameters, or delete the menu item
Before you change anything, make a full copy of your project folder so you can go back.
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For this problem, it lists unregistered parameter names, and the paid version registers the ones with a known type in one click.
Get Avatar Setup Doctor (Free version available)