Trying to get LAME MP3 Encoder to Work

I followed the steps to get LAME MP3 Encoder to work with SONAR, but I keep getting this error:

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SONAR 8 Producer Edition
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The MP3 encoder must be unlocked before use.  Please visit http://www.cakewalk.com to upgrade a previous encoder, or to purchase a new encoder.
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OK  
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when you export the mp3 make sure that you scroll down to something like "lame mp3.." and don't choose the standard "mp3"-profile.

frank has it right - but it's what ever you NAMED the external config settings that you want to choose.  most people and most people's examples of how to get it to work usually use "LAME MP3" as the example, but what did YOU save it as?  that's what you need to choose from the pull down list when you export.

I used to have this on my Sonar Web Page (when I had a web page).

Open SONAR and go to Tools -> Cakewal Ext. Encoder Config.
In the Friendly Name Field write: LAME MP3 Encoder (or whatever you want to call it) 
In the Extension field write: .mp3.
In the Description field write whatever you want.
In the Path field write the path where the LAME encoder is located. That is where lame.exe and lame_enc.dll are located. I keep my LAME encoder in my C:\Program Files\Cakewalk\Shared Utilities\Lame Folder or (copy and past the extracted zip file to your Sonar shared utilities folder and then when you have to perform this step, click the browse button to find the location.
In the Command Line field write: lame -b 192 -m j %I %O
Press Save button.
Uncheck Keep Wave File (unless you want to keep it).

This will export to a 192Kbps stereo mp3 file. If you want 128Kbps, replace 192 with 128 in the Command Line field. The next time you click on File->Export->Audio in SONAR you'll find 'LAME MP3 encoder' as a type of audio.