[Koha] problem regarding zebra !

Dear friends, While running my catalog search, i went through the output and error log and found fllowing errors: 1. zebra queue demon is stopped by signal 15. 2. can't connect to local mysal server through socket /var/run/mysqld/mysqld.sock 3. Explain schema is not found, check profile path. I have checked profilepath in zebra-biblio.cfg and other two configuration files and this have the profile path containg explain.att. What may be the problem. Any help would be appriciated. Thanks in advance Regards Rekha