XF 2.1 Class XF\\Authentication\\APG does not exist

[kahovn]

I have an error Class XF\\Authentication\\APG does not exist in Xenfor 2.1
Please help me!!

 

[Ozzy47]

What is the exact full error with the stack trace and request state?

 

[kahovn]

What is the exact full error with the stack trace and request state?

#14 {main}',
'user_id' => 0,
'message' => 'Class XF\\Authentication\\APG does not exist',
'filename' => 'src/XF/Container.phpLine: 267',
)[2020-08-17 08:30:22]
array (
'trace_string' => '#0 src/XF/App.php(1551): XF\\Container->createObject(\'XF\\\\Authenticati...\', Array)
#1 src/XF/Container.php(228): XF\\App->XF\\{closure}(\'XF\\\\Authenticati...\', Array, Object(XF\\Container))
#2 src/XF/App.php(2770): XF\\Container->create(\'auth\', \'XF\\\\Authenticati...\', Array)
#3 src/XF/Entity/UserAuth.php(58): XF\\App->auth(\'XF\\\\Authenticati...\', Array)
#4 src/XF/Entity/UserAuth.php(22): XF\\Entity\\UserAuth->getAuthenticationHandler()
#5 src/XF/Service/User/Login.php(126): XF\\Entity\\UserAuth->authenticate(\'*****\')
#6 src/XF/Pub/Controller/Login.php(89): XF\\Service\\User\\Login->validate(\'*****\', NULL)
#7 src/XF/Mvc/Dispatcher.php(321): XF\\Pub\\Controller\\Login->actionLogin(Object(XF\\Mvc\\ParameterBag))
#8 src/XF/Mvc/Dispatcher.php(248): XF\\Mvc\\Dispatcher->dispatchClass(\'XF:Login\', \'Login\', Object(XF\\Mvc\\RouteMatch), Object(xenMade\\SEO\\XF\\Pub\\Controller\\Login), NULL)
#9 src/XF/Mvc/Dispatcher.php(100): XF\\Mvc\\Dispatcher->dispatchFromMatch(Object(XF\\Mvc\\RouteMatch), Object(xenMade\\SEO\\XF\\Pub\\Controller\\Login), NULL)
#10 src/XF/Mvc/Dispatcher.php(50): XF\\Mvc\\Dispatcher->dispatchLoop(Object(XF\\Mvc\\RouteMatch))
#11 src/XF/App.php(2177): XF\\Mvc\\Dispatcher->run()