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In my Unity project I am facing an unknown error and error of loading library files

when I load my unity project it is showing me the 2 errors because of which I can't run my project. The errors are:
Unknown error occurred while loading 'Library/Artifacts/22/22ec59139bb4d4489ae56859248015ff'.
...and:
Library\PackageCache\com.unity.test-framework#1.1.29\UnityEngine.TestRunner\NUnitExtensions\Runner\TestCommandBuilder.cs(65,31): error CS0246: The type or namespace name 'ImmediateEnumerableCommand' could not be found (are you missing a using directive or an assembly reference?).
If anybody will help me to understand these issues.
I am using unity version 2021.1.25f1 and editor for C# script is visual studio 2022

This would occur when the version of your com.unity.test-framework package does not match the version of Unity editor you are using. Basically, there is a mismatch somewhere. I recommend going to your Windows > Asset Manager editor window, find all test related packages, and try to update them or uninstall/reinstall.
The most common cause for this issue is when someone upgrades the version of Unity that they are using (or downgrades), but doesn't go to check the compatibility of existing packages with the new Unity version. It can happen for other reasons, so I am not saying for sure that you changed Unity versions. But more often than not, this will fix your issue.

while VSbuild task getting error error MSB4057: The target "_IsProjectRestoreSupported" does not exist in the project.,

Working on wpf application, with Wix to create .msi. why am i getting error
D:\a\1\s\wpfsetup\wpfsetup.wixproj : error MSB4057: The target
"_IsProjectRestoreSupported" does not exist in the project
using msbuild version '17.2.1.25201
NuGet Version: 4.4.1.4656

Please check if the below steps help to fix the issue:
As per my research, it seems to be many bug fixes in every alternate version of the MS Build like 15.8.1, 16.11, etc.
There are some breaking changes and behavior changes mentioned in the MSFT official documentation of MSBuild 17.0. Please check this documentation to know more information if these changes with their resolutions helps to fix the issue.
And it might be the folder path in the build was wrong. Target Name must include the name of the solution folder. Refer this.
Try Restoring the MSBuild Nuget Package Version using this command:
nuget restore MySolution.sln -MSBuildVersion 16.11

ARCore ApiTrackableTypeExtensions.cs error after updating ARCore

I am updating my project from ARCore 1.2 (pretty sure) to 1.6. I imported the most up to date unity package for ARCore (1.6) and I am getting the following error in the console:
Assets/GoogleARCore/SDK/Scripts/Api/ApiTrackableTypeExtensions.cs(31,40):
error CS0050: Inconsistent accessibility: return type
GoogleARCoreInternal.ApiTrackableType' is less accessible than method
GoogleARCoreInternal.ApiTrackableTypeExtensions.GetApiTrackableType(this
Type)'
I am not sure how to resolve this. The Visual Studio 'quick fix' is not helpful in this case. I have tried reimporting ARCore 1.6 but that did not help.

Seems like that was a leftover file. Removing the /scripts/API folder and then reimporting it updated that folder and fixed the error.

Error while installing (entity component) package in unity

Steps Which I followed :
Download latest version of unity 2018.2.0f2
After installing unity I changed Scripting runtime version 4.x
then I tried to install entity package from package manager but I am getting following error:
An error occurred while resolving packages:
One or more packages could not be added to the local file system:
com.unity.burst: write EPROTO 101057795:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt.c:797:
com.unity.incrementalcompiler: write EPROTO 101057795:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt.c:797:
com.unity.package-manager-ui: write EPROTO 101057795:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt.c:797:
com.unity.textmeshpro: write EPROTO 101057795:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt.c:797:
A re-import of the project may be required to fix the issue or a manual modification of E:/New Unity Project (3)/Packages/manifest.json file.
Assembly has reference to non-existent assembly 'Unity.Burst' (Packages/com.unity.entities/Unity.Transforms/Unity.Transforms.asmdef)
Can somebody help me to resolve this problem? thanks in advance.

Unity's Entity Component System is still in experimental mode and requires Unity beta version to use it. The Unity 2018.2.0f2 version you are currently using is not a beta version.
Change your instruction for step #1 and download Unity 2018.1.0b12 from here. Follow the rest of the instruction as they are.
It's also worth noting that the Entity Component System will only work in the Editor at this time. Don't expect it to work in a build for now.

How to solve this error in Unity? (System.Net.Sockets)

I got much help through Stackoverflow.
Recently, I checked this error when I used Unity.
SystemException: 'System.Net.Sockets' are supported only with Unity Android Pro. Referenced from assembly 'Assembly-CSharp'
To solve this error, I did it as follows :
I would open up Visual Studio and do a Find in Files for "System.Net.Sockets". The file name was 'UDPReceive.cs'.
I searched script for finding script error. But I didn't find script error.
I did find another solution. The solution is to add '#if UNITY_EDITOR' at the very top of any file that uses 'System.Net.Sockets' and '#endif' at the bottom of files. But this error occured continuingly.
I deleted 'Assembly-CSharp' file and 'UDPReceive.cs'. But this error was not solved and more errors occur X_X
So, I wanna solve this error.
Could you notify solution of this error to me?
Is there only solution using paid Android Pro?
+) My Unity Version is 4.6.3 & Unity Pro Version (Internal Develop Version)