[C++API] E NPUTransfer: Please open transfer first!

我也碰到了
E NPUTransfer: Please open transfer first!
E NPUTransfer: Please open transfer first!
E NPUTransfer: Please open transfer first!
E NPUTransfer: Please open transfer first!
E NPUTransfer: Please open transfer first!
E NPUTransfer: Please open transfer first!
E NPUTransfer: Please open transfer first!
E NPUTransfer: Please open transfer first!
E NPUTransfer: Please open transfer first!