Keyword not supported Entity Framework C#

Question

I am working on a project that is on .NET Framework 4 and when I enter the Update-Database command in the package manager console, I encounter this error:

Keyword not supported: 'initial catalog'

My connection string in app.config:

<connectionStrings>
    <add name="DocsControlDBConnectionString"
         connectionString="Data Source=.;Initial Catalog=DocsControl_DB;Integrated Security=True" 
         providerName="System.Data.SqlServerCe.4.0"/>
</connectionStrings>

And my DbContext:

public class Context : DbContext
{
    public Context() : base("DocsControlDBConnectionString")
    { 
    }

    public DbSet<Document> Documents { get; set; }
    public DbSet<ActivityTime> ActivityTimes { get; set; }
    public DbSet<Approver> Approvers { get; set; }
    public DbSet<CustomFormat> CustomFormats { get; set; }
    public DbSet<Delete> Deletes { get; set; }
    public DbSet<DocumentName> DocumentNames { get; set; }
    public DbSet<EditDate> EditDates { get; set; }
    public DbSet<EditNumber> EditNumbers { get; set; }
    public DbSet<PDFFile> PDFFiles { get; set; }
    public DbSet<Producer> Producers { get; set; }
    public DbSet<Review> Reviews { get; set; }
    public DbSet<Models.Type> Types { get; set; }
    public DbSet<UserRole> UserRoles { get; set; }
    public DbSet<WordFile> WordFiles { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}

Please guide me