Error message

Deprecated function: Use of "static" in callables is deprecated in Drupal\user\Entity\Role::postLoad() (line 172 of core/modules/user/src/Entity/Role.php).

Drupal\user\Entity\Role::postLoad(Object, Array) (Line: 423)
Drupal\Core\Entity\EntityStorageBase->postLoad(Array) (Line: 353)
Drupal\Core\Entity\EntityStorageBase->loadMultiple(Array) (Line: 16)
Drupal\user\RoleStorage->isPermissionInRoles('access content', Array) (Line: 112)
Drupal\Core\Session\UserSession->hasPermission('access content') (Line: 105)
Drupal\Core\Session\AccountProxy->hasPermission('access content') (Line: 154)
Drupal\Core\Access\AccessResult::allowedIfHasPermissions(Object, Array, 'OR') (Line: 43)
Drupal\user\Access\PermissionAccessCheck->access(Object, Object)
call_user_func_array(Array, Array) (Line: 160)
Drupal\Core\Access\AccessManager->performCheck('access_check.permission', Object) (Line: 136)
Drupal\Core\Access\AccessManager->check(Object, Object, Object, 1) (Line: 113)
Drupal\Core\Access\AccessManager->checkRequest(Object, Object, 1) (Line: 110)
Drupal\Core\Routing\AccessAwareRouter->checkAccess(Object) (Line: 95)
Drupal\Core\Routing\AccessAwareRouter->matchRequest(Object) (Line: 112)
Symfony\Component\HttpKernel\EventListener\RouterListener->onKernelRequest(Object, 'kernel.request', Object)
call_user_func(Array, Object, 'kernel.request', Object) (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.request') (Line: 145)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 191)
Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128)
Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)