| VRC0001 | Try-Catch-Finally is not supported | Error |
| VRC0002 | Does not support throwing exceptions | Error |
| VRC0003 | Udon does not support instantiating non-GameObject types | Error |
| VRC0004 | The specified event is deprecated use the version with VRCPlayerApi | Error |
| VRC0005 | Udon does not currently support type checking with the `is` keyword | Error |
| VRC0006 | The `as` keyword is not yet supported by Udon | Error |
| VRC0007 | Method is not exposed to Udon | Error |
| VRC0008 | Field is not exposed to Udon | Error |
| VRC0009 | Type is not exposed to Udon | Error |
| VRC0010 | Cannot sync variable because behaviour is set to NoVariableSync, change the behaviour sync mode to sync variables | Warning |
| VRC0011 | Udon does not currently support syncing of the type | Warning |
| VRC0012 | Udon does not support linear interpolation of the synced type | Warning |
| VRC0013 | Udon does not support smooth interpolation of the synced type | Warning |
| VRC0014 | Udon does not support variable tweening when the behaviour is in Manual Sync Mode | Warning |
| VRC0015 | Syncing of array type is only supported in manual sync mode | Warning |
| VRC0016 | The method specified for SendCustomEvent must be public | Warning |
| VRC0017 | The method specified for over the network cannot start with an underscore | Warning |
| VRC0018 | The method specified for SendCustomEvent is not declared in the behaviour | Warning |
| VRC0019 | NetworkCallableAttribute must be required for calling method via SendCustomNetworkEvent with parameters | Error |
| VRC0020 | The parameter type of method does not match the Nth argument of SendCustomNetworkEvent | Error |
| VRC0021 | Unable to send network event to UdonBehaviour with SyncType 'None' | Warning |
