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(1/1) ContextErrorException

Notice: Undefined offset: 23

in InstructorsController.php (line 1209)
at InstructorsController->instructorAction(object(Request), 'denise-bradley', 'classtypes', '23')
at call_user_func_array(array(object(InstructorsController), 'instructorAction'), array(object(Request), 'denise-bradley', 'classtypes', '23'))in HttpKernel.php (line 162)
at HttpKernel->handleRaw(object(Request), 2)in HttpKernel.php (line 306)
at HttpKernel->handle(object(Request), 2)in Controller.php (line 106)
at Controller->forward('App\\Plugins\\HHC\\Controllers\\Instructor\\InstructorsController::instructorAction', array('param1' => 'denise-bradley', 'param2' => 'classtypes', 'param3' => '23', '_controller' => 'App\\Plugins\\HHC\\Controllers\\Instructor\\InstructorsController::instructorAction'), array('quantity' => 0, 'class' => 0, 'removeCoupon' => ''))in IndexController.php (line 615)
at IndexController->indexAction(object(Request), 'denise-bradley', 'classtypes', '23')
at call_user_func_array(array(object(IndexController), 'indexAction'), array(object(Request), 'denise-bradley', 'classtypes', '23'))in HttpKernel.php (line 162)
at HttpKernel->handleRaw(object(Request), 1)in HttpKernel.php (line 306)
at HttpKernel->handle(object(Request), 1, true)in Kernel.php (line 160)
at Kernel->handle(object(Request))in app.php (line 31)