Site Daemon
Module Installation Culprit :
1. Didn't do a test install other than the current site you have.
2. Forgot to backup the site.
3. Forgot to change the system mode to development mode.
4. After installation didn't clear the cache.
5. When installing didn't used the FTP method.
6. Didn't read the installation instruction.
Remember module installation will change your database and files.