Error in start

[L. Karam]

Hi, i am istalling apache 2.0 for first time, and when try to start de apache, dont work. In the error_log this is written:   [Fri Aug 01 08:08:15 2003] [emerg] (22)Invalid argument: Couldn't set permissions on cross-process lock; check User and Group directives [Fri Aug 01 08:15:54 2003] [warn] pid file /usr/local/apache2/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?   What i have to do ? I have the Debian distribution for Linux     Tks   Leandro Karam   ps. sorry my english