Error while installing software in Fedora-14
 

I am new to Fedora -14 and i was trying to install additional software and packages.
Like i tried to install Rythmbox music player, but everytime this error was shown:
[root@localhost ~]# yum install audacious-plugins-freeworld-mp3
Loaded plugins: langpacks, presto, refresh-packagekit
Adding en_US to language list
Setting up Install Process
No package audacious-plugins-freeworld-mp3 available.
Error: Nothing to do
[root@localhost ~]#
Also, the software updates are not installed, Transaction Error comes as given:

could not add package update for sane-backends-libs-1.0.22-5.fc14(i686)updates: sane-backends-libs-1.0.22-5.fc14.i686

Pl tell me the solution :(

The error actually says it:
No package audacious-plugins-freeworld-mp3 available.

So probably you don't have a repo that provides this package.
rpm -qa | grep audacious

Look if the package that you need is listed there.

As for the second message: could you post the full output?
I would expect a transaction error to have more info (for example conflicting files, ...)

The fedora 14 support has expired Dec 2011, so there won't be any more updates for that version and if you want to keep the system up to date, you should consider upgrading it to the current version.