OJS 3.2.1.3
PHP 7.4.15
Hello
Every time when I try open PKP PN have this error:
[Fri Feb 19 19:57:59 2021] [error] [client 46.30.164.252] PHP Fatal error: Uncaught Error: Call to undefined method Application::getHttpClient() in /var/www/dpnlab/data/www/jrnls.ivet.edu.ua/plugins/generic/pln/PLNPlugin.inc.php:565, referer: https://jrnls.ivet.edu.ua/index.php/1/management/settings/website
[Fri Feb 19 19:57:59 2021] [error] [client 46.30.164.252] Stack trace:, referer: https://jrnls.ivet.edu.ua/index.php/1/management/settings/website
[Fri Feb 19 19:57:59 2021] [error] [client 46.30.164.252] #0 /var/www/dpnlab/data/www/jrnls.ivet.edu.ua/plugins/generic/pln/PLNPlugin.inc.php(454): PLNPlugin->curlGet(‘http://pkp-pln…’, Array), referer: https://jrnls.ivet.edu.ua/index.php/1/management/settings/website
[Fri Feb 19 19:57:59 2021] [error] [client 46.30.164.252] #1 /var/www/dpnlab/data/www/jrnls.ivet.edu.ua/plugins/generic/pln/classes/form/PLNSettingsForm.inc.php(39): PLNPlugin->getServiceDocument(1), referer: https://jrnls.ivet.edu.ua/index.php/1/management/settings/website
[Fri Feb 19 19:57:59 2021] [error] [client 46.30.164.252] #2 /var/www/dpnlab/data/www/jrnls.ivet.edu.ua/plugins/generic/pln/PLNPlugin.inc.php(343): PLNSettingsForm->initData(), referer: https://jrnls.ivet.edu.ua/index.php/1/management/settings/website
[Fri Feb 19 19:57:59 2021] [error] [client 46.30.164.252] #3 /var/www/dpnlab/data/www/jrnls.ivet.edu.ua/lib/pkp/classes/controllers/grid/plugins/PluginGridHandler.inc.php(234): PLNPlugin->manage(Array, Object(Request)), referer: https://jrnls.ivet.edu.ua/index.php/1/management/settings/website
[Fri Feb 19 19:57:59 2021] [error] [client 46.30.164.252] #4 /var/www/dpnlab/data/www/jrnls.ivet.edu.ua/lib/pkp/classes/core/PKPRouter.inc.php(391): PluginGridHandler->manage(Array, Object(Request)), referer: https://jrnls.ivet.edu.ua/index.php/1/management/settings/website
[Fri Feb 19 19:57:59 2021] [error] [client 46.30.164.252] #5 /var/www/dpnlab/data/www/jrnls.ivet.edu.ua/lib/pkp/classes/core/PKPComponentRouter.inc.php(257): PKPRouter->_authorizeInitializeAndCallRequest(Array, O in /var/www/dpnlab/data/www/jrnls.ivet.edu.ua/plugins/generic/pln/PLNPlugin.inc.php on line 565, referer: https://jrnls.ivet.edu.ua/index.php/1/management/settings/website
Any ideas why it happens?
And how to solve it.
Thx )