I'm sorry you're having trouble with your Joomla administration area following your backup restore. While researching this, I found this to be an issue for quite a few Joomla users with various modules.
The most frequent cause I found in my research was an issue with the #_MENU table (replace # with your table prefix, usually jos). That table needs to have an entry of ID 1 as Menu_Item_Root. If not, Joomla gives the error you are seeing. Using PHPmyAdmin, you can view and edit the Menu_Item_Root in your #_table (usually jos_menu). You can either change the number in that field to 1 or run the following query in the SQL screen (using jos_menu as the example table name):
INSERT INTO `jos__menu`
VALUES ( 1, '', 'Menu_Item_Root', 'root', '', '', '', '', 1, 0, 0, 0, 0, 0, '0000-00-00 00:00:00', 0, 0, '', 0, '', 0, 281, 0, '*', 0 ) ;
I found this particular solution on the Joomla forums:
While you may not be using the particular module the thread was started for, this solution should still be helpful.
Please let us know if this fixes the issue for you. If not, please let us know the name of the module you are trying to install and we will be happy to assist further.
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