Error message after install, package not loaded

[Gh0st422]

I got the error "Failed to resolve packages: The file [C:\Users\Name\2D Game\Packages\manifest.json] is not valid JSON:
Syntax error: duplicated keys "com.unity.2d.tilemap.extras" near tras": "ht. No packages loaded. A re-import of the project may be required to fix the issue or a manual modification of C:/Users/Name/2D Game/Packages/manifest.json file." after following the instruction of putting the line ""com.unity.2d.tilemap.extras": "https://github.com/Unity-Technologies/2d-extras.git#master"" in "Packages/manifest.json"
Not sure what to do and I need this package to use animated tiles. Any fixes would be very appreciated. I'm using Unity editor 2020.3.27f1 and downloaded 2d-extras-2.2.2.
Before writing that line, I got an error message similar to #293.

[Gh0st422]

Sorry to bother you, I was able to resolve this issue! It was as simple as following this advice:

As mentioned in #280, please use the 2020.3 branch found at https://github.com/Unity-Technologies/2d-extras/tree/2020.3 for the Unity Editor 2020.3.

Hope this helps!