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Not sure if it's the exact same source for the problem as the OP, but your error seems to relate to other issues as well, possibly database corruption.

 

It starts off with:

 

[code]

25-Feb-2012 20:28:46 Debug [DatabaseMaintenanceM]: Found scriptable provider with no attached scripts! Removing...

25-Feb-2012 20:28:46 Error [  MovingPicturesCore]: Error:  System.NotImplementedException: The method or operation is not implemented.

   at Cornerstone.Database.CustomTypes.RelationList`2.RemoveAll(Predicate`1 match)

   at MediaPortal.Plugins.MovingPictures.Database.DatabaseMaintenanceManager.VerifyDataSources()

   at MediaPortal.Plugins.MovingPictures.MovingPicturesCore.Initialize()

25-Feb-2012 20:28:46  Info [ DataProviderManager]: DataProviderManager Starting

25-Feb-2012 20:28:46  Info [ DataProviderManager]: Loading existing data sources...

25-Feb-2012 20:28:46 Error [  MovingPicturesCore]: Error:  System.NullReferenceException: Object reference not set to an instance of an object.

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.updateListsWith(DBSourceInfo newSource)

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.loadProvidersFromDatabase()

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager..ctor()

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.GetInstance()

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.Initialize()

   at MediaPortal.Plugins.MovingPictures.MovingPicturesCore.Initialize()

25-Feb-2012 20:28:46  Info [DatabaseMaintenanceM]: Updating Movie Information... [/code]

 

Followed by a bunch of:

 

[code]

25-Feb-2012 20:28:48  Info [ DataProviderManager]: DataProviderManager Starting

25-Feb-2012 20:28:48  Info [ DataProviderManager]: Loading existing data sources...

25-Feb-2012 20:28:48 Error [UpdateArtworkProcess]: Error retrieving artwork for The Other Guys System.NullReferenceException: Object reference not set to an instance of an object.

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.updateListsWith(DBSourceInfo newSource)

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.loadProvidersFromDatabase()

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager..ctor()

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.GetInstance()

   at MediaPortal.Plugins.MovingPictures.BackgroundProcesses.UpdateArtworkProcess.LookForMissingArtwork()

[/code]

 

And a bunch of:

 

[code]

25-Feb-2012 20:28:51  Info [ DataProviderManager]: Loading existing data sources...

25-Feb-2012 20:28:51  Info [ DataProviderManager]: DataProviderManager Starting

25-Feb-2012 20:28:51 Fatal [       MovieImporter]: Unhandled error in MediaScanner. System.NullReferenceException: Object reference not set to an instance of an object.

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.updateListsWith(DBSourceInfo newSource)

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.loadProvidersFromDatabase()

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager..ctor()

   at MediaPortal.Plugins.MovingPictures.DataProviders.DataProviderManager.GetInstance()

   at MediaPortal.Plugins.MovingPictures.LocalMediaManagement.MovieImporter.GetMatches(MovieMatch mediaMatch)

   at MediaPortal.Plugins.MovingPictures.LocalMediaManagement.MovieImporter.ProcessNextPendingMatch()

   at MediaPortal.Plugins.MovingPictures.LocalMediaManagement.MovieImporter.ScanMedia()

[/code]

 

Did you perhaps upgrade from an older MediaPortal v1.1.x or older setup? Quick test would be to rename your movingpictures.db3 to movingpictures_backup.db3 and then open up MovingPictures config and configure for example "N:\Example Parth With Just One Movie" as a quick import test path to see if things work fine then.

 

If everything works fine, then your movingpicture_backup.db3 most likely has some corruption and it might be easiest/best to just redo everything then.

 

PS: If you use IMDb+ plugin, and do the test, you will have to rerun the IMDb+ GUI plugin as well to get the IMDb+ scraper-script to reinstall into the new MovPic database,