Fixed small typo in error reporting for number of nodes
Fixed small typo in error reporting for number of nodes

tepl/qbsolv,myriagon/qbsolv,myriagon/qbsolv,tepl/qbsolv,tepl/qbsolv,myriagon/qbsolv,myriagon/qbsolv,tepl/qbsolv,myriagon/qbsolv