Dears, When migrating SharePoint 2010 to 2013, the following Error Occurs after executing test-spcontentdatabase:
Category : WideListSchema
Error : True
UpgradeBlocking : True
Message : The list 'Tasks' at URL '/Lists/Tasks' has a schema that is
incompatible with this version of SharePoint.
Remedy : Delete some fields from the list 'Tasks'."
Locations :
Although I have deleted the list from the SharePoint site then a backup/restore the sharepoint 2010 site database again.
Khaled Moawad --- http://kholyos.blogspot.com