Update

src/AdminServiceProvider.php

@@ -170,7 +170,7 @@ class AdminServiceProvider extends ServiceProvider
         if ($this->app->runningInConsole()) {
             $this->publishes([__DIR__.'/../config' => config_path()], 'dcat-admin-config');
             if (version_compare($this->app->version(), '9.0.0', '>=')) {
-                $this->publishes([__DIR__.'/../resources/lang' => $this->app->langPath()], 'dcat-admin-lang');
+                $this->publishes([__DIR__.'/../resources/lang' => lang_path()], 'dcat-admin-lang');
             } else {
                 $this->publishes([__DIR__.'/../resources/lang' => resource_path('lang')], 'dcat-admin-lang');
             }