I just upgraded my 4.0 installation to 4.5.2

When I click a folder in the media section i get the following error :

[KeyNotFoundException: The given key was not present in the dictionary.]
   System.ThrowHelper.ThrowKeyNotFoundException() +28
   System.Collections.Generic.Dictionary`2.get_Item(TKey key) +2646188
   umbraco.cms.businesslogic.datatype.controls.Factory.GetNewObject(Guid DataEditorId) +72
   umbraco.cms.businesslogic.datatype.controls.Factory.DataType(Guid DataTypeId) +63
   umbraco.cms.businesslogic.datatype.DataTypeDefinition.get_DataType() +108
   umbraco.cms.businesslogic.datatype.DataTypeDefinition.GetByDataTypeId(Guid DataTypeId) +117
   noerd.Umb.DataTypes.multipleFileUpload.MultipleFileUploadDataType.get_DataEditor() +61
   umbraco.controls.ContentControl.addControlNew(Property p, TabPage tp, String Caption) +331
   umbraco.controls.ContentControl.CreateChildControls() +933
   System.Web.UI.Control.EnsureChildControls() +87
   umbraco.controls.ContentControl.OnInit(EventArgs e) +92
   System.Web.UI.Control.InitRecursive(Control namingContainer) +333
   System.Web.UI.Control.AddedControl(Control control, Int32 index) +198
   System.Web.UI.ControlCollection.Add(Control child) +80
   umbraco.cms.presentation.editMedia.OnInit(EventArgs e) +711
   System.Web.UI.Control.InitRecursive(Control namingContainer) +333
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378

When I remove the upload datatype from the folder media type the error is gone.