Error while installing GEM sqlite3

Hello out there. I am learning Ruby on Rails, and while trying to
the sqlite3 GEM I got the error below (it is under Win 7):

D:\My Documents\workspace\first_app>gem install sqlite3 -v ‘1.3.5’
Successfully installed sqlite3-1.3.5-x86-mingw32
1 gem installed
Installing ri documentation for sqlite3-1.3.5-x86-mingw32…
Installing RDoc documentation for sqlite3-1.3.5-x86-mingw32…
ERROR: While executing gem … (Gem::FilePermissionError)
You don’t have write permissions into the js directory.

I don’t even find the incriminated js directory on my file system (may
that is the issue?).

*gem list *confirms that sqlite3 was installed, so it looks like only
local documentation is not being installed.

Any clue?