read error on connection

#0 /var/www/mag_lorca/public_html/app/code/community/Cm/Cache/Backend/Redis.php(550): Credis_Client->__call('hGet', Array)
#1 /var/www/mag_lorca/public_html/app/code/community/Cm/Cache/Backend/Redis.php(550): Credis_Client->hGet('zc:k:dce_72BCDE...', 't')
#2 /var/www/mag_lorca/public_html/lib/Zend/Cache/Core.php(390): Cm_Cache_Backend_Redis->save('