Error:
Your Personal site cannot be created because Self-Service Site Creation is not enabled. Contact your site administrator for more information.
Reason:
As mentioned in the error message, the "Self-Service Site creation" is not enabled in your central admin.
Solution:
To enable the "Self-Service Site creation" option, just follow the steps given below:
1. Go to the Central admin.
2. Go to the "Application Management" & Select the specific web application.
3. Now, you can see the "Self-Service Site Creation" option in the Ribbon Menu.
4. Click on that Menu item and Select the "On" option in the pop-up window.
5. Click "OK" and now click the "My Content" link from your "My Site" site. You can see the "Processing" screen which means that your steps are correct.
6. Now you can see the newly created personal site. Here, you can create your own blogs, documents, etc...
http://sensoft2000-sharepoint.blogspot.se/2010/08/error-your-personal-site-cannot-be_1808.html