couldn't make a guess for DGS GraphQL Codegen.generated.types

[mghaigh]

Codegen is failling with the Cause "couldn't make a guess for DGS GraphQL Codegen.generated.types.Borrower" I have included the Borrower definition below. The Borrower interface is implemented by 2 object types and returned by a number of queries.
The complete schema has no errors reported. Any ideas why it is failing or what I can do to help the 'guess'?

interface Borrower  {
	borrowerType: BorrowerType
	dateOfBirth: Date
	dateJoined: Date
	currentlyLivesAtAddress: Address
	loanedMediaCopies(first: Int, after: String): BorrowerLoanedMediaCopiesConnection
	loans(first: Int, after: String): BorrowerLoansConnection
	reservedMediaTitles(first: Int, after: String): BorrowerReservedMediaTitlesConnection
	reservation: Reservation
	previouslyLivedAtAddresses: [Address]!
}

Many thanks.

[mghaigh]

Solved. It's avery strange error message but the task packageName was incorrect