Unexpected error!

Non-static method ExtraFunctions::fetchTemplate() cannot be called statically. Line 254 on /home/myedu/domains/myeducationpath.com/html/models/messagemodel.php. We are notified and will solve the problem as soon as possible.

#0 /home/myedu/domains/myeducationpath.com/html/models/messagemodel.php(67): MessageModel->fetchTemplate() #1 /home/myedu/domains/myeducationpath.com/html/models/groupmodel.php(1899): MessageModel->createEmailTexts() #2 /home/myedu/domains/myeducationpath.com/html/controllers/groups.php(348): GroupModel->getInviteTexts() #3 /home/myedu/domains/myeducationpath.com/html/controllers/controller.php(121): GroupsController->_view_Invite() #4 /home/myedu/domains/myeducationpath.com/html/controllers/controller.php(141): Controller->processView() #5 /home/myedu/domains/dean-dashboard.com/src/MEP/BaseApp/Models/MEP.php(227): Controller->display() #6 /home/myedu/domains/myeducationpath.com/app/app/Views/ViewTrait.php(110): BaseApp\Models\MEP->oldControllerAction() #7 /home/myedu/domains/myeducationpath.com/app/app/Views/DefaultView.php(14): app\Views\DefaultView->loadViewFromOldController() #8 /home/myedu/domains/dean-dashboard.com/src/vendor/gelembjuk/webapp/src/Gelembjuk/WebApp/View.php(95): app\Views\DefaultView->view() #9 /home/myedu/domains/dean-dashboard.com/src/vendor/gelembjuk/webapp/src/Gelembjuk/WebApp/Controller.php(191): Gelembjuk\WebApp\View->doView() #10 /home/myedu/domains/dean-dashboard.com/src/vendor/gelembjuk/webapp/src/Gelembjuk/WebApp/Application.php(226): Gelembjuk\WebApp\Controller->action() #11 /home/myedu/domains/myeducationpath.com/html/index.php(5): Gelembjuk\WebApp\Application->action() #12 {main}