[QlikView] Cluster log files shows the error "Exception=System.FormatException: String was not recognized as a valid DateTime"

Cluster log files shows the error "Exception=System.FormatException: String was not recognized as a valid DateTime

05.05.2017 17:49:11.4073981 Error Failed to read from E:\QlikTech\DistributionService\TaskResults\TaskResult_40599ef2-e76b-467c-a70a-9d7268851029.xml. Exception=System.FormatException: String was not recognized as a valid DateTime. || at System.DateTime.Parse(String s) || at QDSMain.TaskResult.ReadXml(XmlReader reader) || at QDSMain.Clustering.ClusterFileHandler.Read(Action`1 readXML)
05.05.2017 17:49:11.4073981 Error Failed to read from E:\QlikTech\DistributionService\TaskResults\TaskResult_54d811be-03f9-4ad4-861f-2f91598e2772.xml. Exception=System.FormatException: String was not recognized as a valid DateTime. || at System.DateTime.Parse(String s) || at QDSMain.TaskResult.ReadXml(XmlReader reader) || at QDSMain.Clustering.ClusterFileHandler.Read(Action`1 readXML)
05.05.2017 17:49:11.4073981 Error Failed to read from E:\QlikTech\DistributionService\TaskResults\TaskResult_6d901d26-3ec2-40ff-a353-f32917384297.xml. Exception=System.FormatException: String was not recognized as a valid DateTime. || at System.DateTime.Parse(String s) || at QDSMain.TaskResult.ReadXml(XmlReader reader) || at QDSMain.Clustering.ClusterFileHandler.Read(Action`1 readXML)​

Please note that standard folder is C:\ProgramData\QlikTech\DistributionService\TaskResults

Environments:

• QlikView 11.20, 10.00, 12.10 and 12.20

If running a QDS cluster check that all server have the same regional settings.

There must have been a system change regarding the timestamp format.

To fix this issue
1- Stop QMC and QDS services.
2- Remove/Backup all files from ..\DistributionService\TaskResults folder
3- Restart the services

You can also clean/backup the files from C:\ProgramData\QlikTech\DistributionService\1\Log