UnityEditor.* is inaccessible due to its protection level

Hi,
I have a game for PC, and I want to make a Android version. I changed the target, and this happens.

C:/Users/Ril/AppData/Local/Unity/cache/packages/packages.unity.com/com.unity.collab-proxy@1.2.9/Editor/Collab/CollabToolbarWindow.cs(26,42): error CS0122: `UnityEditor.Web.WebViewEditorStaticWindow' is inaccessible due to its protection level

C:/Users/Ril/AppData/Local/Unity/cache/packages/packages.unity.com/com.unity.collab-proxy@1.2.9/Editor/Collab/CollabHistoryWindow.cs(13,56): error CS0122: `UnityEditor.Collaboration.ICollabHistoryWindow' is inaccessible due to its protection level

C:/Users/Ril/AppData/Local/Unity/cache/packages/packages.unity.com/com.unity.collab-proxy@1.2.9/Editor/Collab/CollabHistoryWindow.cs(31,20): error CS0122: `UnityEditor.Collaboration.HistoryState' is inaccessible due to its protection level

I know this error comes from a private value being used as a public, but I have a lot of them that come from Unity itself, and not my code. Does anyone know how to fix it?

Thanks!

 

As always, Google first for the error "UnityEditor.Web.WebViewEditorStaticWindow' is inaccessible due to its protection level" and the first link should help.