[Serusers] SER doesn't want to restart

Hello all, I have done some modification in my ser.cfg. And when I decided to restart, it failed. Here the output from "messages" : Sep 3 06:44:57 solo /usr/local/sbin/ser[23168]: Maxfwd module- initializing Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: permissions - initializing Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: Default allow file (/usr/local/etc/ser/permissions.allow) not found => empty rule set Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: Default deny file (/usr/local/etc/ser/permissions.deny) not found => empty rule set Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: AVPops - initializing Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: CHECK_UA - initializing Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: convert_row(): No memory left Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: convert_rows(): Error while converting row #4207 Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: convert_result(): Error while converting rows Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: store_result(): Error while converting result Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: preload_udomain(): Error while doing db_query Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: register_udomain(): Error while preloading domain 'location' Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: domain_fixup(): Error while registering domain Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: ERROR: fix_expr : fix_actions error Sep 3 06:44:58 solo /usr/local/sbin/ser[23168]: CHECK_UA - destroing module I had thinking that my modification were bad, so I leaved them. But SER failed again with the same output. I put some comments before the lines which used "check_ua" module, and then it worked ! I had never experience a problem with "check_ua" before that. Can someone help me to understand why it failed ?