Another blog or Google Site is already using this address

It took me three days to figure out the whole problem with linking up my customized domain with my existing blog.
I almost gave up until i found the solution online; but that is not without many heartache and many confusion.
The most common issue is you get this error message when you are trying to link your blog in blogspot with the domain you purchase would be this :

Another blog or Google Site is already using this address

It's as bad as getting the blue screen of death. Only difference is that this one kills you rather slowly.
I have went through all the "help" section of Blogger, GoogleApps (and the DNS management site that is partly Google and partly Godaddy.com) and they were not of any help. In fact, they made matter worse as I keep struggling with the A name, CNAME, whatchamacallit name.
And still, i get:

Another blog or Google Site is already using this address

and i still fail to link my opstupe.blogspot.com to tristupe.com
Searching online for a solution is like finding a needle in a haystack. Some blogger on technology must understand that not everyone is as good as them to troubleshoot or to understand those codes and syntax. They got me more confused. Way more confused.
Not helping that any changes to the DNS (Domain Name Server) takes about one hour to three days to resolve, my patience was running thin.

Got to have an easier way...the above is standard A and CNAME for GoogleApps. Don't change anything. Note that the CNAME "Blog" was created out of "desperation". It has been removed since.

Going through some "self-help" forum in Blogger Help Forum (BHF), i finally found a solution and i had wished i found this much earlier.
So, if you had the same issue as myself with the above dreaded "error", fear not, here is my solution for you. Let me know if it works.
Firstly, make sure you sign up with WWW.yourdomainname.com. The WWW is very important else you will soon find out that they (while can be re-routed, read on) will cause you some worry.
If you are like me, bought the domain name minus the WWW, (which is why you are here looking for a solution...), just add in the CNAME : WWW and points it to ghs.google.com with 1hour TTL (default). Then just leave it there, don't need to do anything.
Check your "A" as well and ensure that it points to all the 4 IP address noted above. They are the IP of the Google server. If you signed up minus the WWW, the "@" will help to point your domainname.com to www.domainname.com


The following assumes that you purchased your domain through Google Apps.

1. Log-in to you Google Apps domain "Control Panel":  You can cut and paste this "https://www.google.com/a/cpanel/YOURDOMAINNAME.com" and replace YOURDOMAINNAME.com with the domain name you signed up. (e.g : tristupe.com)

2. Then click on "Settings" Tab. It is on the far right side in the BLUE bar.

3. Locate "Sites" on the left column of links (where the other apps like calendar, docs, contacts are located. Sites are usually at the bottom)

4. Under "Site Settings", click on the "Web Address Mapping" link. DELETE all mapping. This is where the problem sits! It may take up to 30minutes for it to "resolve". 

5. Then, click on "Uninstall Sites" in the middle. Don't worry, unless you already have a site that you created in Google Apps' "Sites", you will not lose anything. This step effectively takes your domainname.com away from being listed as a Google Apps' "Sites".

6. If you did Step 5 before Step 4, you might have to add in "Sites" again (from the Dashboard of the Google Apps) to gain access to the "Wed Address Mapping". If you don't remove this, your site will still be having the same "Another blog or Google Site is already using this address".

Once you have completed the steps above, log in back to your Blogger account and link the blogspot account to your customized domain name. If you get it right, you will get to your blog via your new domain name! Else, drop me a note and i see what i can help diagnose for you (though i don't promise a real solution)

It was a 5minutes operation that took me three days to figure out. At the very least, i learnt something new.
One note though, if you created your blog via blogger and using a template you developed (i.e. NOT using the blogger's template design), you will lose the formatting. While it's not really an issue, you should always back up your blog's HTML before attempting any changes.

Have Fun Tri-ing!