I renamed the Unity Project and my Game Stopped Working

Questions & Answers
1

I made a Project with some random name. After I finished my game I felt like the name should be slightly different. So I changed the Project name by closing Unity and Renaming the folder in File Explorer. Then when I launched my Unity. The game stopped working and gave me the following Error

Library\PackageCache\com.unity.2d.ik@1.2.0-preview.2\Editor\IKEditorManager.cs(5,36): error CS0234: The type or namespace name ‘Common’ does not exist in the namespace ‘UnityEngine.Experimental.U2D’ (are you missing an assembly reference?)

I am new to Unity and don’t know what it means when I double-clicked it showed me this

157946-doubtunitynotworking.png
157946-doubtunitynotworking.png1363×802 69.2 KB

Can someone please help me and explain what’s going on so that I can solve it later by myself.
Thanks in Advance

2

Try deleting Experimental part from it. Turning it to:
using UnityEngine.U2D.Common;
helped me.