An Error has occurred

Zend_Controller_Response_Exception: Cannot send headers; headers already sent in /home/digi3x/public_html/access/library/Am/App.php, line 2433 in /home/digi3x/public_html/access/library/Zend/Controller/Response/Abstract.php:323
Stack trace:
#0 /home/digi3x/public_html/access/library/Zend/Controller/Response/Abstract.php(148): Zend_Controller_Response_Abstract->canSendHeaders(true)
#1 /home/digi3x/public_html/access/library/Zend/Controller/Action/Helper/Redirector.php(226): Zend_Controller_Response_Abstract->setRedirect('/access/signup', 302)
#2 /home/digi3x/public_html/access/library/Zend/Controller/Action/Helper/Redirector.php(370): Zend_Controller_Action_Helper_Redirector->_redirect('/access/signup')
#3 /home/digi3x/public_html/access/library/Zend/Controller/Action/Helper/Redirector.php(453): Zend_Controller_Action_Helper_Redirector->setGotoUrl('/access/signup', Array)
#4 /home/digi3x/public_html/access/library/Zend/Controller/Action.php(796): Zend_Controller_Action_Helper_Redirector->gotoUrl('/signup', Array)
#5 /home/digi3x/public_html/access/application/default/controllers/SignupController.php(59): Zend_Controller_Action->redirect('/signup', Array)
#6 /home/digi3x/public_html/access/application/default/controllers/SignupController.php(94): SignupController->loadForm()
#7 /home/digi3x/public_html/access/library/Am/Mvc/Controller.php(128): SignupController->indexAction()
#8 /home/digi3x/public_html/access/library/Am/Mvc/Controller.php(105): Am_Mvc_Controller->_runAction('indexAction')
#9 /home/digi3x/public_html/access/library/Zend/Controller/Dispatcher/Standard.php(307): Am_Mvc_Controller->dispatch('indexAction')
#10 /home/digi3x/public_html/access/library/Zend/Controller/Front.php(956): Zend_Controller_Dispatcher_Standard->dispatch(Object(Am_Mvc_Request), Object(Am_Mvc_Response))
#11 /home/digi3x/public_html/access/library/Am/App.php(2053): Zend_Controller_Front->dispatch()
#12 /home/digi3x/public_html/access/index.php(92): Am_App->run()
#13 {main}:Cannot send headers; headers already sent in /home/digi3x/public_html/access/library/Am/App.php, line 2433