[otrs] config.pm is not writable

Please Help Me! : I am tried to install OTRS in CentOS 4.3. but in the step 2 I have this messaje: Kernel/Config.pm isn't writable! If you want to use the installer, set the Kernel/Config.pm writable for the werserver user! Can't open /opt/otrs/Kernel/Config.pm: Permission denied I reviewed permission for this file but it´s right. Please can you help me. Y tried everything and this not start. Regards, Leonardo Ordóñez --