FIX: Better error msgs
FIX: Better error msgs

Eric89GXL/mnefun,Eric89GXL/mnefun,LABSN/mnefun,ktavabi/mnefun,kambysese/mnefun,LABSN/mnefun,drammock/mnefun,drammock/mnefun,ktavabi/mnefun,kambysese/mnefun