使用Shakapacker时出现找不到@hotwired/turbo-rails模块错误求助

我正在使用Shakapacker（项目基于react-rails），已经严格遵循Shakapacker入门章节的所有步骤操作，但还是碰到错误：Uncaught Error: Cannot find module '@hotwired/turbo-rails'，不清楚问题出在哪，麻烦大家帮忙看看。

相关配置文件内容 #

config/importmap.rb #

# Pin npm packages by running ./bin/importmap

pin "application", preload: true
pin "@hotwired/turbo-rails", to: "turbo.min.js", preload: true
pin "@hotwired/stimulus", to: "stimulus.min.js", preload: true
pin "@hotwired/stimulus-loading", to: "stimulus-loading.js", preload: true
pin_all_from "app/javascript/controllers", under: "controllers"

app/javascript/application.js #

import "@hotwired/turbo-rails" 
import "controllers"

错误截图 #

内容的提问来源于stack exchange，提问作者CoolGuy