Hi,

After creating a custom image type with an image cropper property. DAMP throws an 'unknown exception' when attempting to upload an image of this type. Please note the error message seems to vary from time to time

Versions:
Umbraco 6.1.4
Digibiz Advanced Media Picker 2.5

Steps taken:
Create a new media type underneath image call it 'Custom image' for example
Allow 'Custom image' as a child node type of Folder.
Create a custom datatype using Image cropper as the editor.
Use umbracoFile as the property alias, check save crop images and add a custom crop.
Add this custom image cropper as a property of 'Custom image'.
Create a custom image picker using DAMP, in the settings allow it to select and create 'Custom image'.
Assign the custom image picker to a document type.
In the content menu try and upload an image of type 'Custom image'.


Error Message from log:
2013-08-23 15:05:53,914 [71] INFO umbraco.BusinessLogic.Log - [Thread 43] Redirected log call (please use Umbraco.Core.Logging.LogHelper instead of umbraco.BusinessLogic.Log) | Type: Error | User: 0 | NodeId: -1 | Comment: Exception: Object reference not set to an instance of an object. - StackTrace: at DigibizAdvancedMediaPicker.DigibizAdvancedMediaPicker.ConvertXML(XDocument xmlDocument)
2013-08-23 15:06:06,720 [71] INFO umbraco.BusinessLogic.Log - [Thread 24] Redirected log call (please use Umbraco.Core.Logging.LogHelper instead of umbraco.BusinessLogic.Log) | Type: Error | User: 0 | NodeId: -1 | Comment: Exception: Object reference not set to an instance of an object. - StackTrace: at umbraco.editorControls.imagecropper.DataTypeData.ToXMl(XmlDocument data)

 at Umbraco.Core.Models.PropertyExtensions.ToXml(Property property, IDataTypeService dataTypeService)
 at Umbraco.Core.Models.PropertyExtensions.ToXml(Property property)
 at Umbraco.Core.Services.PackagingService.Export(IContentBase contentBase, String nodeName)
 at Umbraco.Core.Services.PackagingService.Export(IMedia media, Boolean deep)
 at Umbraco.Core.Models.ContentExtensions.ToXml(IMedia media)
 at Umbraco.Core.Services.MediaService.CreateMediaWithIdentity(String name, Int32 parentId, String mediaTypeAlias, Int32 userId)
 at umbraco.cms.businesslogic.media.Media.MakeNew(String Name, MediaType dct, User u, Int32 ParentId)
 at DigibizAdvancedMediaPicker.CreateMediaItem.BtnCreate_Click(Object sender, EventArgs e)

2013-08-23 15:06:08,633 [71] ERROR umbraco.DataLayer.SqlHelper`1[[System.Data.SqlClient.SqlParameter, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] - [Thread 34] Error executing query select xml from cmsContentXml where nodeID = 1069

System.ArgumentException: The query didn't return a value.
 at umbraco.DataLayer.SqlHelper`1.ExecuteXmlReader(String commandText, P[] parameters)
 at umbraco.DataLayer.SqlHelper`1.ExecuteXmlReader(String commandText, IParameter[] parameters)