Getting Error When Using

Apr 4 at 2:36 PM
When ever I try and use the feature I get the Sorry Something Went Wrong with a correlation ID. When investigating in the ULS logs I see the following message.

Application error when access /_layouts/15/NY.ExportVersionHistory/ExportVersionHistory.aspx, Error=Object reference not set to an instance of an object. at NY.ExportVersionHistory.Layouts.NY.ExportVersionHistory.ExportVersionHistory.ExportHistory(String[] items, String listID) at NY.ExportVersionHistory.Layouts.NY.ExportVersionHistory.ExportVersionHistory.Page_Load(Object sender, EventArgs e) at System.EventHandler.Invoke(Object sender, EventArgs e) at Microsoft.SharePoint.WebControls.UnsecuredLayoutsPageBase.OnLoad(EventArgs e) at Microsoft.SharePoint.WebControls.LayoutsPageBase.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 0bb5e49d-7acb-a0f7-a7b9-6b6705b0007f

Any suggestions on how to get this to work?

Thanks In Advance