I am getting the following error when trying to access #btProduct document type.
this is the message I get:
[NullReferenceException: Object reference not set to an instance of an object.]umbraco.controls.ContentTypeControlNew.IconClassToIconFileName(String iconClass) +4
System.Linq.WhereSelectListIterator`2.MoveNext() +104
System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +460
System.Linq.Enumerable.ToList(IEnumerable`1 source) +58
umbraco.controls.ContentTypeControlNew.SetupInfoPane() +595
umbraco.controls.ContentTypeControlNew.OnInit(EventArgs e) +28
System.Web.UI.Control.InitRecursive(Control namingContainer) +134
System.Web.UI.Control.InitRecursive(Control namingContainer) +290
System.Web.UI.Control.InitRecursive(Control namingContainer) +290
System.Web.UI.Control.InitRecursive(Control namingContainer) +290
System.Web.UI.Control.InitRecursive(Control namingContainer) +290
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +489
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