Getting Data through storedProc in Webapi using entityframework

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MVC4

WebAPI

entity-framework

, +

Am getting error :cannot implicitly convert type 'system.data.objects.objectresult to system.collections.generic.IEnumarable

Web Api Controller code

private PTMEntities db = new PTMEntities();

    public IEnumerable<GetAllCompanies_Result> GetAllCompanies()
    {

        using (var db = new PTMEntities())
        {
            return db.GetAllCompanies();
        }
    }

Model1.context.cs code here

 public virtual ObjectResult<GetAllCompanies_Result> GetAllCompanies()
    {
        return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction<GetAllCompanies_Result>("GetAllCompanies");
    }