Qlik Web Connector does not start or starts and stops immediately

The Qlik Web Connector does not start or Start and Stops immediately. Following error can be observed in the Connector Log:

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Qlik Web Connectors Startup Error
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An unexpected error has occurred [1] - please copy this message (Ctrl+c) and send to http://www.qlik.com/services/support:
System.InvalidOperationException: There is an error in XML document (0, 0). ---> System.Xml.XmlException: Root element is missing.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.XmlTextReader.Read()
   at System.Xml.XmlReader.MoveToContent()
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderConfigSettings.Read4_ConfigSettings()
   --- End of inner exception stack trace ---
   at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
   at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)
   at APIConnectorEngine.Qwc.XmlFileSettingsStorerGeneric.LoadSettings()
   at APIConnectorEngine.Qwc.XmlFileSettingsStorerGeneric.<>c__DisplayClass11_0.<GetAllKeys>b__0()
   at APIConnectorEngine.Qwc.XmlFileSettingsStorerWithMutex.RunLocked(Action action)
   at APIConnectorEngine.Qwc.XmlFileSettingsStorerGeneric.GetAllKeys()
   at APIConnectorEngine.Qwc.EncryptedXmlFileSettingsStorer.GetAllKeys()
   at APIConnectorWeb.Services.Licensing.LicenceManager.Load()
   at APIConnectorWeb.Services.Licensing.LicenceManager.StartupCheck(Action`1 startupLogger)
   at QlikWebConnectors.WebBootstrap.LicenceChecks(ILicenceManager licenceManager)
   at APIConnectorWeb.Startup.WebBaseBootstrap.StartCommon(String appRoot, String relativeConfigFilePath)
   at APIConnectorEngine.Qwc.BaseBootstrap.Start(Boolean isService)
   at APIConnectorEngine.Qwc.BaseBootstrap.StartNonServiceVersion(Boolean isAzure)
System.Xml.XmlException: Root element is missing.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.XmlTextReader.Read()
   at System.Xml.XmlReader.MoveToContent()
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderConfigSettings.Read4_ConfigSettings()
Please try restarting Qlik Web Connectors.

 

Reinstall the Web connector package or upgrade to the newest version.