Can't compile strategy - missing NinjaTrader.Gui.dll?

[crc863]

I am receiving the following errors on my test script

   using NinjaTrader.Gui.NinjaScript; namespace NinjaTrader.NinjaScript.Strategies {     public class Test : Strategy     {         [NinjaScriptProperty]         [Range(1, int.MaxValue)]         [Display(Name = "TestParam")]         public int TestParam { get; set; }     } }  
​

[NinjaTrader_ChelseaB]

Hello crc863,

You may have removed the necessary default using statements.

Create a new strategy from the NinjaScript Editor.
Copy all of the default using statements from the top of the new script to your custom script.

Let me know if this does not resolve the errors.