Why isn't my new module listed in the list of modules? I am trying to build a new module, but, it is not listed in the list of modules.

This is the content of the add_new_chapter.info file:

;$Id$

name = Chapters field
description = Will create a field that will refrence a node of type chapter type
package = Online School Development
core = 7.x
files[] = add_new_chapter.module


I placed the add_new_chapter.info file in the directory "add_new_chapter" at 
drupalroot/sites/all/modules/add_new_chapter.

what I expect is to see a new category ("Online School Development") in the page listing the modules but it doesn't get listed.

I tried to clear the Drupal cache, but the module didn't get listed too.
The first things I would check:


Permissions settings of the files (chmod - chown)
Remove a module to see if it has any effect