contains an additional column Region at the end:

static void Main(string[] args) string pkgPath = args[0]; // Path to master package string schemaFile = args[1]; // JSON schema var pkg = Application.LoadPackage(pkgPath, null);

is a defect that surfaces only in runtime , when the metadata (column names, data types, lengths, nullability) that SSIS builds at design‑time does not match the actual schema that the source delivers at execution. The error message looks like: