Connection String for LocalDB in EntityFrameCore in an ASP.NET Core 2 Project

In a simple ASP.NET Core 2 Application in which I am using CodeFirst, I am trying to run Update-Database command in PackageManger Console Window (an InitialMigratio has already been created successfully). However I get the followin error.
Keyword not supported: 'mulitpleactiveresultsets'.
I suspect there is probably some erroy in my Connection String in my appsettings.json file.
The ConnectionString I have in appsettings.json file currently looks like this.

 "ConnectionStrings": {
    "Default": "Server=(localdb)\\mssqllocaldb;Database=Webroute;Trusted_Connection=True;MulitpleActiveResultSets=true"
  },

I would appreciate if could let me know if there is any error in the way I have defined the connection string and if the ConnectionString is correct what could the cause of the error message (Keyword not supported: 'mulitpleactiveresultsets'.) I am getting and how could I fix this.
Thank you for your help.

The complet appsettings.json file in my project looks like this:

{

 "ConnectionStrings": {
    "Default": "Server=(localdb)\\mssqllocaldb;Database=Webroute;Trusted_Connection=True;MulitpleActiveResultSets=true"
  },
  
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Warning"
    }
  }
}

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