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this code worked on 2019-09-01, but now I get an error.
Maybe this testnet-update-september-4th effect? https://community.libra.org/t/testnet-update-september-4th/1630
The Libra testnet was reset. There are no old transactions. I took the address from your sample, and the current sequence number is zero.
This exception you are seeing is because the getSignedTransaction() method does not check if the returned GRPC call contains a valid signedTransactionWP, and it winds up getting a null-value. If it checked for null, it could return an error and not an exception.
You can see the lack of transactions on that address using LibExplorer:
The testnet update does appear to break the current libra-core, and you can't perform any transactions at the moment.