Too many connections

SELECT CNPJ_PREF FROM PARAMETROS WHERE URL_SRV = 'entreriosdeminas.nfiss.com.br'
/Funcoes/Conexao/MySQL.php:249 Excecao()
   /Funcoes/Classes/Banco_De_Dados.php:596 query()
    /Funcoes/Classes/Cliente.php:23 query()
     /Funcoes.php:214 cnpjDaPrefeitura()
      /Cabecalho.php:57 include()
       /index.php:17 include()