Multiple errors: "The type or namespace name ['x'] does not exist"

[robrtoprz]

SPECIFIC ISSUE ENCOUNTERED

When I start a new project in Unity and import the ARCore Unity SDK v1.13.0, I get multiple errors.

VERSIONS USED

• Unity: 2019.2.9f1
• ARCore SDK for Unity: 1.13.0

STEPS TO REPRODUCE THE ISSUE

1. Start a new project in Unity Hub.
2. Switch Platform to Android
3. Import ARCore Unity SDK v1.13.0
4. In Console you will get 17 errors.

ADDITIONAL COMMENTS

Also since the version 1.12.0 I get this errors, these are the errors that I get in the console:

1. Assets\GoogleARCore\SDK\InstantPreview\Scripts\InstantPreviewManager.cs(33,23): error CS0234: The type or namespace name 'SpatialTracking' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)
2. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\AnchorController.cs(32,37): error CS0246: The type or namespace name 'NetworkBehaviour' could not be found (are you missing a using directive or an assembly reference?)
3. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\AnchorController.cs(99,30): error CS0115: 'AnchorController.OnStartClient()': no suitable method found to override
4. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\AnchorController.cs(46,10): error CS0246: The type or namespace name 'SyncVarAttribute' could not be found (are you missing a using directive or an assembly reference?)
5. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\AnchorController.cs(46,10): error CS0246: The type or namespace name 'SyncVar' could not be found (are you missing a using directive or an assembly reference?)
6. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\AnchorController.cs(46,18): error CS0246: The type or namespace name 'hook' could not be found (are you missing a using directive or an assembly reference?)
7. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\AnchorController.cs(141,10): error CS0246: The type or namespace name 'CommandAttribute' could not be found (are you missing a using directive or an assembly reference?)
8. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\AnchorController.cs(141,10): error CS0246: The type or namespace name 'Command' could not be found (are you missing a using directive or an assembly reference?)
9. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\CloudAnchorsNetworkManager.cs(31,47): error CS0246: The type or namespace name 'NetworkManager' could not be found (are you missing a using directive or an assembly reference?)
10. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\CloudAnchorsNetworkManager.cs(49,46): error CS0246: The type or namespace name 'NetworkConnection' could not be found (are you missing a using directive or an assembly reference?)
11. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\CloudAnchorsNetworkManager.cs(73,49): error CS0246: The type or namespace name 'NetworkConnection' could not be found (are you missing a using directive or an assembly reference?)
12. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\CloudAnchorsNetworkManager.cs(49,30): error CS0115: 'CloudAnchorsNetworkManager.OnClientConnect(NetworkConnection)': no suitable method found to override
13. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\CloudAnchorsNetworkManager.cs(73,30): error CS0115: 'CloudAnchorsNetworkManager.OnClientDisconnect(NetworkConnection)': no suitable method found to override
14. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\LocalPlayerController.cs(30,42): error CS0246: The type or namespace name 'NetworkBehaviour' could not be found (are you missing a using directive or an assembly reference?)
15. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\LocalPlayerController.cs(46,30): error CS0115: 'LocalPlayerController.OnStartLocalPlayer()': no suitable method found to override
16. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\LocalPlayerController.cs(82,10): error CS0246: The type or namespace name 'CommandAttribute' could not be found (are you missing a using directive or an assembly reference?)
17. Assets\GoogleARCore\Examples\CloudAnchors\Scripts\LocalPlayerController.cs(82,10): error CS0246: The type or namespace name 'Command' could not be found (are you missing a using directive or an assembly reference?)

I tried to find a post of this issues but I couldn't found, so maybe this issue is only for me or maybe someone else have this issue too. Thank you.

[robrtoprz]

So, I did something, now I have 8 errors. In Package Manager I upgrade Rider Editor, Test Framework and Visual Studio Code Editor, and all the errors of ARCore were gone, but now I have 8 errors coming from Rider Editor:

[secondage]

use Window > Package Manager to install the Multiplayer HLAPI and XR Legacy Input Helpers packages.

[robrtoprz]

When I try, I will update the post, thank you!

Edit: YES, it works, thank you so much!

[piginhat]

It works for me thanks :-)

https://developers.google.com/ar/develop/unity/quickstart-android

[jymjam]

use Window > Package Manager to install the Multiplayer HLAPI and XR Legacy Input Helpers packages.

Cheers! worked for me too. Wasted a whole day trying to fix this issue manually

[nongzhang]

good job！I import ARCore SDK for Unity v1.18.0 into Unity 2019.4.2f1, too many errors: "The type or namespace name ['x'] does not exist"occur. it's fixed by the method above.

[chiragpranami]

use Window > Package Manager to install the Multiplayer HLAPI and XR Legacy Input Helpers packages.

It worked...Thank you

[dndat97]

I use Unity 2020.2.0b2 and I cannot find Multiplayer HLAPI and XR Legacy Input Helpers packages in Package Manager. Could someone help me please?

[AndreFoxVR]

I use Unity 2020.2.0b2 and I cannot find Multiplayer HLAPI and XR Legacy Input Helpers packages in Package Manager. Could someone help me please?

For Unity 2020, I used Window > Package Manager and pressed the + (plus) sign: Add Package from git URL and set it to:

com.unity.multiplayer-hlapi
and

com.unity.xr.legacyinputhelpers
as it was recommended here: https://medium.com/@jeffreymlynch/where-are-the-missing-preview-packages-in-unity-2020-3ad0935e4193

[cardosohs]

@AndreFoxVR worked like a charm for me. Thanks a bunch!

[EvanThomasKaduthanam]

I use Unity 2020.2.0b2 and I cannot find Multiplayer HLAPI and XR Legacy Input Helpers packages in Package Manager. Could someone help me please?

In Unity 2018.4.29f1 I cannot Find It. i cannot find the upload from git option too

[hrushikesh26]

Missing XR Legacy Input Helpers in Package Manager. Unity Version 2020.3.5f1