we haven't been able to reproduce the existing error in DNn 4.8.4, though a few forum users still reported it to be existing. I am suggesting not to use scheduled sync, but use auto sync and - after changes to folder structure (create/rename/delete of folders) erform a manual recursive sync in admin :: file manager.

I am experiencing precisely the same conditions precisely stated in this thread (I found it by googling my error message - System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Services.FileSystem.FolderController.GetMappedDirectory(String VirtualDirectory). My DB grew from 82M to 422M overnight. I am running 4.9.1. I have turned off auto sync, as stated and the error hasn't returned in the 30 mins since turning it off. Not the ideal situation to offer my clients but neither was having my clients report general exception errors to me and getting my event log filled with them. Thanks for looking further into this situation and hopefully finding a long-term solution. And, thanks for all your work.

John

Hi all,

Same errors in my DNN. Event viewer is filling this with these errors.

This is the error :

AssemblyVersion: -1
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL:
AbsoluteURL:
AbsoluteURLReferrer:
UserAgent:
DefaultDataProvider:
ExceptionGUID:
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: -1
FileColumnNumber: -1
Method:
StackTrace:
Message: System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Services.FileSystem.FolderController.GetMappedDirectory(String VirtualDirectory)
Source:

I'll try to explain what happend.

The errors shows up when i have installed the UMG module from BizModules.

In my event viewer this enabled.
BizModules.UltraPhotoGallery.Scheduling.AutoSyncScheduler, BizModules.UltraPhotoGallery

When i enable the auto sync in dnn i get this error also :

THREAD ID: 23
TYPE: DotNetNuke.Services.FileSystem.SynchronizeFileSystem
EXCEPTION: The path is not of a legal form.
RESCHEDULED FOR: 29/01/2009 12:06:05
SOURCE: STARTED_FROM_BEGIN_REQUEST
ACTIVE THREADS: 0
FREE THREADS: 1
READER TIMEOUTS: 0
WRITER TIMEOUTS: 0
IN PROGRESS: 0
IN QUEUE: 8

Just to provide enough information on this error.

Regards

Stijn