#0 /var/www/presidio/var/composer/vendor/imsglobal/lti-1p3-tool/src/lti/LTI_Message_Launch.php(81): IMSGlobal\LTI\LTI_Message_Launch->validate_state()
#1 /var/www/framework/bss/modules/LTI/Controller.php(129): IMSGlobal\LTI\LTI_Message_Launch->validate()
#2 /var/www/framework/bss/modules/Routing/CallbackHandler.php(45): At_LTI_Controller->launch()
#3 /var/www/framework/bss/modules/Routing/CallbackHandler.php(20): Bss_Routing_CallbackHandler->doCallback()
#4 /var/www/framework/bss/modules/Routing/Manager.php(313): Bss_Routing_CallbackHandler->handleRequest()
#5 /var/www/framework/bss/modules/Routing/Manager.php(92): Bss_Routing_Manager->route()
#6 /var/www/framework/bss/modules/Routing/Manager.php(43): Bss_Routing_Manager->forward()
#7 /var/www/presidio/public/index.php(28): Bss_Routing_Manager->dispatchRequest()
#8 /var/www/presidio/public/index.php(31): Bss_App_Start()
#9 {main}