There has been an error processing your request Front controller reached 100 router match iterations

Question

my magneto version is 1.9 suddenly i saw this error:

files are OK because when i change to another database Site working correctly could you help me,please?

There has been an error processing your request

Front controller reached 100 router match iterations

Trace:
0 /home/user/domains/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(179): Mage::throwException('Front controlle...')
1 /home/diamo/domains/domain.com/public_html/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
2 /home/user/domains/domain.com/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array) 3 /home/user/domains/domain.com/public_html/index.php(71): Mage::run('', 'store') 4 {main}