Hello! I'm trying to upgrade a site from umbraco 7 to umbraco 8 and I'm following the official guide. The migration quits with a error but no real error message, it just says look at the log file. I can't seem to find the error in the log file. Here are the last lines in the log file:

{"@t":"2020-01-13T15:29:18.9756187Z","@mt":"Skip item id=14018, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"}

{"@t":"2020-01-13T15:29:18.9756187Z","@mt":"Skip item id=14019, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14020, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14021, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14022, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14023, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14024, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14025, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14026, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14027, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14028, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:18.9765923Z","@mt":"Skip item id=14029, could not find parent id=14017.","@l":"Warning","SourceContext":"Umbraco.Web.PublishedCache.NuCache.ContentStore","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.0718617Z","@mt":"{EndMessage} ({Duration}ms) [Timing {TimingId}]","EndMessage":"Completed.","Duration":2790,"TimingId":"afc9129","SourceContext":"Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.1603589Z","@mt":"{StartMessage} [Timing {TimingId}]","StartMessage":"Loading media from database","TimingId":"34b3ac8","SourceContext":"Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.3983781Z","@mt":"{EndMessage} ({Duration}ms) [Timing {TimingId}]","EndMessage":"Completed.","Duration":237,"TimingId":"34b3ac8","SourceContext":"Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.4001083Z","@mt":"Starting initialize async background thread.","SourceContext":"Umbraco.Web.Search.BackgroundIndexRebuilder","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.4542511Z","@mt":"Forcing index {IndexerName} to be unlocked since it was left in a locked state","IndexerName":"InternalIndex","SourceContext":"Umbraco.Examine.ExamineExtensions","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.4542511Z","@mt":"Forcing index {IndexerName} to be unlocked since it was left in a locked state","IndexerName":"MembersIndex","SourceContext":"Umbraco.Examine.ExamineExtensions","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.4552484Z","@mt":"Forcing index {IndexerName} to be unlocked since it was left in a locked state","IndexerName":"ExternalIndex","SourceContext":"Umbraco.Examine.ExamineExtensions","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.4552484Z","@mt":"Call was made to RebuildIndexes but the task runner for rebuilding is already running","@l":"Warning","SourceContext":"Umbraco.Web.Search.BackgroundIndexRebuilder","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"WARN ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.4552484Z","@mt":"{EndMessage} ({Duration}ms) [Timing {TimingId}]","EndMessage":"Booted.","Duration":10132,"TimingId":"0475b75","SourceContext":"Umbraco.Core.Runtime.CoreRuntime","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":1,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":1,"HttpRequestId":"19dc154d-4830-4643-b7b1-ba84536835b8"} {"@t":"2020-01-13T15:29:19.6362029Z","@mt":"New url {Url} detected, re-discovering application url.","Url":"http://localhost:12726/umbraco","SourceContext":"Umbraco.Core.Sync.ApplicationUrlHelper","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":36,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":2,"HttpRequestId":"0afd1e32-9e0e-402b-9686-2e5b9037fcfb"} {"@t":"2020-01-13T15:29:19.6382170Z","@mt":"ApplicationUrl: {UmbracoAppUrl} (UmbracoModule request)","UmbracoAppUrl":"http://localhost:12726/umbraco","SourceContext":"Umbraco.Core.Sync.ApplicationUrlHelper","ProcessId":15948,"ProcessName":"iisexpress","ThreadId":36,"AppDomainId":3,"AppDomainAppId":"LMW3SVC5ROOT","MachineName":"DESKTOP-3DAD8HE","Log4NetLevel":"INFO ","HttpRequestNumber":2,"HttpRequestId":"0afd1e32-9e0e-402b-9686-2e5b9037fcfb"}

Any help on this would be greatly appreciated :)