add informative exceptions when nls schema issues occur
add informative exceptions when nls schema issues occur

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