better error message
better error message

nytlabs/streamtools,pfig/streamtools,deepglint/streamtools,wxdublin/streamtools,pfig/streamtools,jacqui/streamtools,wxdublin/streamtools,jacqui/streamtools,wxdublin/streamtools,wxdublin/streamtools,pfig/streamtools,nytlabs/streamtools,deepglint/streamtools,deepglint/streamtools,jacqui/streamtools,nytlabs/streamtools,pfig/streamtools,nytlabs/streamtools,jacqui/streamtools,deepglint/streamtools