informative error when environment is unspecified
informative error when environment is unspecified

intentionet/batfish,intentionet/batfish,intentionet/batfish,intentionet/batfish,batfish/batfish,dhalperi/batfish,batfish/batfish,arifogel/batfish,dhalperi/batfish,dhalperi/batfish,arifogel/batfish,intentionet/batfish,batfish/batfish,arifogel/batfish