"object refrence not set to an instance of object" error at column visibility Property

I Found the object reference error at below Code:

 gvInsuredData.Columns("DescriptionProperty").Visible = True

why i'm getting "Object reference not set to an instance of an object" error When i create DataGridView Column dynamically.

Note: when i click on first time on the button i didn't get Above error but when i click the button second time it gives me reference error .