please help me add a column to a asp web app mysql; table

I am trying to type Enable-Migrations into my package manager console but this error shows up

PM> Enable-Migrations
System.ArgumentException: The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

Server stack trace:
at EnvDTE.Properties.Item(Object index)
at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at EnvDTE.Properties.Item(Object index)
at System.Data.Entity.Migrations.Extensions.ProjectExtensions.GetPropertyValue[T](Project project, String propertyName)
at System.Data.Entity.Migrations.MigrationsDomainCommand.GetFacade(String configurationTypeName, Boolean useContextWorkingDirectory)
at System.Data.Entity.Migrations.EnableMigrationsCommand.FindContextToEnable(String contextTypeName)
at System.Data.Entity.Migrations.EnableMigrationsCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

I updated my ApplicationUser Class to add in some new strings that i want to be added to my db as columns. When i register a user I need a string to store that persons profile picture. I was thinking that this app may have two different databases when i go to SqlServerObject Explorer i have two different sql databases. Could there be a problem there or maybe when i type Enable-Migrations it may be confused which db it is but i wouldn't know how to correct it. That is all i can research. The answer is near I am just exhausted and have to move on. Please help thanks.

I am lost please help.

public class ApplicationUser : IdentityUser
{
// public string Name { get; set; }

// public DateTime DOB { get; set; }

public string profilePicturePath { get; set; }

// public string JSONString { get; set; }

// public Boolean IsOnline { get; set; }
}

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("DefaultConnection")
{
}
}

#region Helpers
public class UserManager : UserManager<ApplicationUser>
{
public UserManager()
: base(new UserStore<ApplicationUser>(new ApplicationDbContext()))
{
}
}