Entity Framework – The ALTER TABLE statement conflicted with the FOREIGN KEY constraint

System.Data.SqlClient.SqlException (0x80131904): The ALTER TABLE statement conflicted with the FOREIGN KEY constraint “FK_dbo.ScheduleStateReports_dbo.UploadFile_UploadFileID”. The conflict occurred in database “aspnet-cpa”, table “dbo.UploadFile”, column ‘ID’.

Solution
Delete data from both tables.

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