Errror When Clicking on Media Folder

I have it working in other instances of Umbraco, but for some reason Multiple File Upload stopped working in our development instance. Here's the error:

Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


An unhandled exception was generated during the execution of the current
 web request. Information regarding the origin and location of the 
exception can be identified using the exception stack trace below.

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   umbraco.cms.businesslogic.datatype.DataTypeDefinition.GetByDataTypeId(Guid DataTypeId) +77
   noerd.Umb.DataTypes.multipleFileUpload.MultipleFileUploadDataType.get_DataEditor() +176
   umbraco.controls.ContentControl.addControlNew(Property p, TabPage tp, String Caption) +380
   umbraco.controls.ContentControl.CreateChildControls() +3440
   System.Web.UI.Control.EnsureChildControls() +181
   umbraco.controls.ContentControl.OnInit(EventArgs e) +126
   System.Web.UI.Control.InitRecursive(Control namingContainer) +132
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +276
   umbraco.cms.presentation.editMedia.OnInit(EventArgs e) +1269
   System.Web.UI.Control.InitRecursive(Control namingContainer) +132
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1969

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1008

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Jos Huybrighs 23 posts 55 karma points

Jan 30, 2014 @ 22:39

I have the same error when clicking on any folder in Media. Clicking on Media itself or selecting a media item all looks OK. The stack trace is a bit different as it doesn't mention MultipleFile upload.
I installed version 6.1.6 and have let the install page to the necessary database updates.

Don't think however that it has anything to do with the migrated database because when I create a new folder in Media exactly the same error pops up.

Anyone knows about this?

Here is the stack trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   umbraco.cms.businesslogic.property.Property..ctor(Property property) +77
   umbraco.cms.businesslogic.Content.<InitializeProperties>b__e(Property x) +25
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +145
   System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection) +454
   umbraco.cms.businesslogic.Content.InitializeProperties() +177
   umbraco.cms.businesslogic.Content.getProperty(String alias) +43
   umbraco.controls.ContentControl.LoadPropertyTypes(IContentTypeComposition contentType, TabPage tabPage, Hashtable inTab, Int32 tabId, String tabCaption) +228
   umbraco.controls.ContentControl.CreateChildControls() +486
   System.Web.UI.Control.EnsureChildControls() +83
   umbraco.controls.ContentControl.OnInit(EventArgs e) +38
   System.Web.UI.Control.InitRecursive(Control namingContainer) +134
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +191
   System.Web.UI.ControlCollection.Add(Control child) +86
   umbraco.cms.presentation.editMedia.OnInit(EventArgs e) +585
   System.Web.UI.Control.InitRecursive(Control namingContainer) +134
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +489

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