Error Object reference not set to an instance of an object appears on a page containing a Custom Form part

Error: Object reference not set to an instance of an object.
StackTrace: at NCC.Custom.Forms.Common.FormTwoColumnHTMLFormat.BuildFormFieldControl(Field fld)
at NCC.Custom.Forms.Common.FormTwoColumnHTMLFormat.BuildFormFieldTableRow(Field f)
at NCC.Custom.Forms.Common.FormTwoColumnHTMLFormat.GetFormDisplay(Form frm)
at NCC.Custom.Forms.Common.Form.Display(FormDisplayType mode)
at NCC.Custom.Forms.Web.display.Page_PreRender1(Object sender, EventArgs e)
Edit the Custom Form part and ensure any fields which display a selection to the user are populated with selections. These field types include: RadioButtonList, RadioButtonListWithOther, Checkbox, CheckboxList, and DropDownList.

Environment

 Custom Form 1.0.0.0
 Custom Form 1.0.14.4

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