Unable to open PDO connection [wrapped: SQLSTATE[HY000] [1040] Too many connections]

#0 /var/www/magento/lib/Redarea/Auth/Adapter/Guest.php(43): Redarea_Utility_JsonRpcClient->sendRequest('Account.insertG...', Array)
#1 /var/www/magento/lib/Redarea/Auth.php(36): Redarea_Auth_Adapter_Guest->authenticate()
#2 /var/www/magento/app/code/local/Rikorda/Core/Model/Session.php(165): Redarea_Auth->authenticate(Object(Redarea_Auth_Adapter_Guest))
#3 /var/www/magento/app/code/core/Mage/Core/Model/Session/Abstract/Varien.php(228): Rikorda_Core_Model_Session->start('frontend')
#4 /var/www/magento/app/code/core/Mage/Core/Model/Session/Abstract.php(84): Mage_Core_Model_Session_Abstract_Varien->init('core', 'frontend')
#5 /var/www/magento/app/code/core/Mage/Core/Model/Session.php(42): Mage_Core_Model_Session_Abstract->init('core', 'frontend')
#6 /var/www/magento/app/code/core/Mage/Core/Model/Config.php(1357): Mage_Core_Model_Session->__construct(Array)
#7 /var/www/magento/app/Mage.php(466): Mage_Core_Model_Config->getModelInstance('core/session', Array)
#8 /var/www/magento/app/Mage.php(480): Mage::getModel('core/session', Array)
#9 /var/www/magento/app/code/local/Rikorda/Core/Controller/Router.php(101): Mage::getSingleton('core/session', Array)
#10 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Rikorda_Core_Controller_Router->match(Object(Mage_Core_Controller_Request_Http))
#11 /var/www/magento/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#12 /var/www/magento/app/Mage.php(687): Mage_Core_Model_App->run(Array)
#13 /var/www/magento/index_rikorda.php(188): Mage::run('', 'store')
#14 {main}