implemented error message for metaSMT-server in case of invalid input
implemented error message for metaSMT-server in case of invalid input

hoangmle/metaSMT,finnhaedicke/metaSMT,agra-uni-bremen/metaSMT,nbruns1/metaSMT,nbruns1/metaSMT,finnhaedicke/metaSMT,agra-uni-bremen/metaSMT,agra-uni-bremen/metaSMT,hoangmle/metaSMT,hoangmle/metaSMT,nbruns1/metaSMT,finnhaedicke/metaSMT