# I want to resolve the error 'ContactEnterInfo'

**URL:** <https://ask.vrchat.com/t/i-want-to-resolve-the-error-contactenterinfo/47987>\
**Category:** Help!\
**Tags:** world, udon, sdk3, unity\
**Created:** [March 6, 2026, 3:13am UTC](https://ask.vrchat.com/t/i-want-to-resolve-the-error-contactenterinfo/47987 "2026-03-06T03:13:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![karubonn919](https://yyz1.discourse-cdn.com/vrchat/user_avatar/ask.vrchat.com/karubonn919/32/28602_2.png) [@karubonn919](https://ask.vrchat.com/u/karubonn919)\
**Post date:** [March 6, 2026, 3:13am UTC](https://ask.vrchat.com/t/i-want-to-resolve-the-error-contactenterinfo/47987/1 "2026-03-06T03:13:27Z")

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I want to add a ‘VRC Contact Receiver’ to the world and determine whether my avatar’s ‘VRC Contact Sender’ has touched it, but even when I add:

using UdonSharp;  
using UnityEngine;  
using VRC.SDKBase;  
using VRC.Udon;  
using VRC.SDK3.Dynamics;  
using VRC.SDK3.Dynamics.Contact.Components;  
using VRC.SDK3.Dynamics.Contact;

I get the error ‘error CS0246: The type or namespace name ‘ContactEnterInfo’ could not be found (are you missing a using directive or an assembly reference?)’

in the

public void OnContactEnter(ContactEnterInfo contactInfo){}

section. How can I resolve this?

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**Author:** ![docteh](https://yyz1.discourse-cdn.com/vrchat/user_avatar/ask.vrchat.com/docteh/32/12171_2.png) [@docteh](https://ask.vrchat.com/u/docteh)\
**Post date:** [March 7, 2026, 7:13pm UTC](https://ask.vrchat.com/t/i-want-to-resolve-the-error-contactenterinfo/47987/2 "2026-03-07T19:13:16Z")

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I decided to search github for ContactEnterInfo and see what shakes out.

> <https://github.com/wv2v47pq4z-create/prz-ai-ei-os-anthropic/blob/3dcebee0c60583ffa070b5d904db90978e7190b7/VRChatWorld/Packages/com.vrchat.worlds/Runtime/Udon/Dynamics/ContactReceiverUdonEmitter.cs#L4>

Depending on what you wanna do, maybe try like VRC.Dynamics.ContactEnterInfo instead?Or maybe you can use VRC.Dynamics, csharp is something I don’t really do that much of. But yeah the namespace VRC.Dynamics line is declaring a default namespace in that file

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**Author:** ![Luciferium](https://yyz1.discourse-cdn.com/vrchat/user_avatar/ask.vrchat.com/luciferium/32/45339_2.png) [@Luciferium](https://ask.vrchat.com/u/Luciferium)\
**Post date:** [March 7, 2026, 7:20pm UTC](https://ask.vrchat.com/t/i-want-to-resolve-the-error-contactenterinfo/47987/3 "2026-03-07T19:20:43Z")

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well considering they’re not even valid in the base udonsharp class I think they might’ve straight up forgot to include them for udonsharp

 ![image](https://global.discourse-cdn.com/vrchat/original/3X/c/8/c810a8c8c995b40aca3e189610fa126c52abf37a.png)