Error : Qlikview system.argumentnullexception value cannot be null

[#1]

Hi,

I have a plan that works perfectly but sometimes I get the message below:

19/02/2016 07:00:00 Error The task "xxxxxx.qvw" failed. Exception:

QDSMain.Exceptions.DistributionFailedException: Distribute failed with errors to follow. ---> System.ArgumentNullException: La valeur ne peut pas être null.

Nom du paramètre : stringToUnescape

   à System.Uri.UnescapeDataString(String stringToUnescape)

   à QDSMain.DistributeTask.GetFileName(String path)

   à QDSMain.DistributeTask.Execute(TaskResult currentTaskResult)

   --- Fin de la trace de la pile d'exception interne ---

   à QDSMain.DistributeTask.Execute(TaskResult currentTaskResult)

   à QDSMain.Task.AbstractTask.TaskExecution(ILogBucket logBucket, TaskResult taskResult)

Config :

Qlikview 11.00.11414.0

Windows Server 2003 SP2

.Net framework 4.0

[Chanty4u]

Restart all the services and clear the cache.

[#3]

if I reload it works but the problem is that I have 50 planfication and I can not restart services each time