Remove package from project

I am new to Unity, my Unity version is 2017.3.1f1

recently my project showing error while compilling

The package Newtonsoft.Json with version 12.0.1 could not be found in C:\Users\User\.nuget\packages\. Run a NuGet package restore to download the package.

Since the package is not necessary, I want to remove it from my project, but I have no idea how can I do it, I saw some post talk about package manager under window tab, but it is not showing in my Unity.

any idea what can I do?

 

One thing you might try (make a back up first) is to choose Reset Packages to Default under the Help menu. I was having a similar problem recently, and it worked for me.

 

There is no Reset Packages under my help menu?

 

Ah, it's different type of package! This is referring to a nuget package, not Unity Package Manager. sorry. Please show a screenshot of your project, and the error? That seems like a Visual Studio message.

 

ah, I deleted all cache like migrationBackups folder, app.config, and obj folder then rebuild solution then it is solved.