用 composer 将 fecmall 从 2.16 升级到 2.2.1，发现后台页面都打不开了

D:\web\fecshop
λ composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 11 updates, 0 removals
  - Updating yiisoft/yii2 (2.0.25 => 2.0.26): Downloading (100%)
  - Updating fancyecommerce/fecshop (2.1.6 => 2.2.1): Downloading (100%)
  - Updating symfony/dom-crawler (v4.3.3 => v4.3.4): Downloading (100%)
  - Updating symfony/browser-kit (v4.3.3 => v4.3.4): Downloading (100%)
  - Updating symfony/service-contracts (v1.1.5 => v1.1.6): Downloading (100%)
  - Updating symfony/console (v4.3.3 => v4.3.4): Downloading (100%)
  - Updating symfony/css-selector (v4.3.3 => v4.3.4): Downloading (100%)
  - Updating symfony/event-dispatcher (v4.3.3 => v4.3.4): Downloading (100%)
  - Updating symfony/finder (v4.3.3 => v4.3.4): Downloading (100%)
  - Updating symfony/yaml (v4.3.3 => v4.3.4): Downloading (100%)
  - Updating phpunit/phpunit (7.5.14 => 7.5.15): Downloading (100%)
Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead.
Writing lock file
Generating autoload files

如图，用 composer 将 fecmall 从 2.16 升级到 2.2.1 后，后台主页打不开了，提示：Child Service [admin] does not exist in fecshop\services\Application, you must config it!

后来，参照官方升级文档操作，执行如下操作：

1. 直接将文件：https://github.com/fecshop/yii2_fecshop_app_advanced/blob/master/composer.json 里面的内容覆盖本地fecshop根目录的 composer.json文件

2. 执行composer selfupdate

3. 执行composer update

4. 执行yii migrate --interactive=0 --migrationPath=@fecshop/migrations/mysqldb

D:\web\fecshop
composer selfupdate
You are already using composer version 1.9.0 (stable channel).

D:\web\fecshop
λ composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead.
Writing lock file
Generating autoload files

D:\web\fecshop
λ yii migrate --interactive=0 --migrationPath=@fecshop/migrations/mysqldb
Yii Migration Tool (based on Yii v2.0.26)

No new migrations found. Your system is up-to-date.

还是没有解决。求助

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