Problem with 2sxc after installing on dnn 7.4.2 adn can't install any app

Nov 5, 2015 at 3:12 PM
I have the following error during any action on the 2sxc module or app:

AbsoluteURL:/DesktopModules/2sxc/API/GettingStarted/InstallPackage
DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke
ExceptionGUID:f1e9f19e-4560-45f5-a5e9-f825e648a632
AssemblyVersion:
PortalId:-1
UserId:-1
TabId:-1
RawUrl:
Referrer:
UserAgent:
ExceptionHash:ZEkflKDmw0JIV2XvtT2guQ==
Message:Object reference not set to an instance of an object.
StackTrace:
at ToSic.SexyContent.Templates.UpdateTemplate(Nullable1 templateId, String name, String path, String contentTypeStaticName, Nullable1 contentDemoEntity, String presentationTypeStaticName, Nullable1 presentationDemoEntity, String listContentTypeStaticName, Nullable1 listContentDemoEntity, String listPresentationTypeStaticName, Nullable1 listPresentationDemoEntity, String templateType, Boolean isHidden, String location, Boolean useForList, Boolean publishData, String streamsToPublish, Nullable1 pipelineEntity, String viewNameInUrl)
at ToSic.SexyContent.ImportExport.XmlImport.ImportXmlTemplates(XElement root)
at ToSic.SexyContent.ImportExport.XmlImport.ImportXml(Int32 zoneId, Int32 appId, XDocument doc)
at ToSic.SexyContent.ImportExport.ZipImport.ImportZip(Stream zipStream, HttpServerUtility server, PortalSettings portalSettings, List`1 messages)

Any ideas on how to solve that

Regards, Machiel Broekman