[syslog-ng] Problems configuring syslog-ng

Hello, I'm trying to configure syslog-ng to log messages from local0 into a directory under the /usr tree. I'm sure that my configuration is correct, but the syslog-ng cannot write the file. When I switch to logging in /var tree, it works. My question is: Cannot I log into another directory? -- Att. Marcus Vinícius S. Mendes Pré-Processamento CPTEC/INPE Ramal 8676