Error - JUser: :_load: Unable to load user with ID: 42

I have just installed the Boutique template and when I click on the Blog menu item it comes up with the following error.
So:
Below is the steps. Please backup your database before making changes. Change "Jos" with your prefix as it might be different.

1. Open your Joomla database using PHPMyadmin tool.
2. Open "jos_users" table,
3. Find record with "Super User" name and click on edit icon,
4. Change Super User id value to 42 and click on "Go" button,
5. Open "jos_user_usergroup_map" table.
6. Find the record with "group_id" value 8, change "user_id" value to 42, then click on "Go" button,
7. Logout and login again.

But now the error is JUser :: _Load: Unable to load user with id: 225

What is the problem?

The template is Financial Business - Joomla 2.5