要执行bundle install，安装这个插件所依赖的gems，然后再重新启动redmine

重启报错日志如下：
App 12524 output: Error: The application encountered the following error: Could not find gem 'haml-rails’ in any of the gem sources listed in your Gemfile. (Bundler::GemNotFound)
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/resolver.rb:290:in `block in verify_gemfile_dependencies_are_found!'
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/resolver.rb:258:in `each’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/resolver.rb:258:in `verify_gemfile_dependencies_are_found!'
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/resolver.rb:49:in `start’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/resolver.rb:22:in `resolve’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/definition.rb:258:in `resolve’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/definition.rb:170:in `specs’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/definition.rb:237:in `specs_for’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/definition.rb:226:in `requested_specs’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/runtime.rb:101:in `block in definition_method’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/runtime.rb:20:in `setup’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler.rb:149:in `setup’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/setup.rb:20:in `block in <top (required)>'
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/ui/shell.rb:136:in `with_level’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/ui/shell.rb:88:in `silence’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/bundler-2.1.2/lib/bundler/setup.rb:20:in `<top (required)>'
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/ruby_supportlib/phusion_passenger/loader_shared_helpers.rb:361:in `activate_gem’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/ruby_supportlib/phusion_passenger/loader_shared_helpers.rb:221:in `block in run_load_path_setup_code’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/ruby_supportlib/phusion_passenger/loader_shared_helpers.rb:525:in `running_bundler’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/ruby_supportlib/phusion_passenger/loader_shared_helpers.rb:220:in `run_load_path_setup_code’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:91:in `preload_app’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:189:in `block in <module:App>'
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/ruby_supportlib/phusion_passenger/loader_shared_helpers.rb:378:in `run_block_and_record_step_progress’
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:188:in `<module:App>'
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:30:in `<module:PhusionPassenger>'
App 12524 output: /data/Tools/Redmine-4.2.1/Init/ruby/lib/ruby/gems/2.6.0/gems/passenger-6.0.5/src/helper-scripts/rack-preloader.rb:29:in `<main>'
[ E 2022-02-22 10:37:23.8733 10466/T1b age/Cor/App/Implementation.cpp:221 ]: Could not spawn process for application /data/Tools/Redmine-4.2.1/Init/apps/redmine/htdocs/: The application encountered the following error: Could not find gem 'haml-rails’ in any of the gem sources listed in your Gemfile. (Bundler::GemNotFound)
Error ID: ec488f22
Error details saved to: /tmp/passenger-error-KqM6G3.html

[ E 2022-02-22 10:37:23.8759 10466/T8 age/Cor/Con/CheckoutSession.cpp:276 ]: [Client 1-8] Cannot checkout session because a spawning error occurred. The identifier of the error is ec488f22. Please see earlier logs for details about the error.

@xiaoxiao

Errno::EACCES: Permission denied @ rb_sysopen - /home/redmine/redmine/db/schema.rb

从报错看，你应该是执行了rake相关命令，它要更新/home/redmine/redmine/db/schema.rb文件，而这个文件没有写权限。给它增加写权限后再试试看：

chmod +w /home/redmine/redmine/db/schema.rb

4.2.X版本安装重启报错

Note:
  All old sessions will become invalid.
  Please specify the REDMINE_SECRET_TOKEN parameter for persistence.
  **SHOULD** be defined if you have a load-balancing Redmine cluster.
Configuring redmine::max_concurrent_ajax_uploads...
Configuring redmine::sudo_mode...
Configuring redmine::autologin_cookie...
Configuring redmine::backups...
Configuring redmine::rmagic::font...
Configuring nginx...
Configuring nginx::redmine...
Installing plugins...
Installing gems required by plugins...
You are replacing the current local value of without, which is currently "development:test" 
Migrating plugins. Please be patient, this could take a while...
rake aborted!
Errno::EACCES: Permission denied @ rb_sysopen - /home/redmine/redmine/db/schema.rb
/home/redmine/data/tmp/bundle/ruby/2.7.0/gems/activerecord-5.2.6/lib/active_record/railties/databases.rake:250:in `initialize'
/home/redmine/data/tmp/bundle/ruby/2.7.0/gems/activerecord-5.2.6/lib/active_record/railties/databases.rake:250:in `open'
/home/redmine/data/tmp/bundle/ruby/2.7.0/gems/activerecord-5.2.6/lib/active_record/railties/databases.rake:250:in `block (3 levels) in <top (required)>'
/home/redmine/redmine/lib/tasks/redmine.rake:142:in `block (3 levels) in <top (required)>'
/home/redmine/data/tmp/bundle/ruby/2.7.0/gems/rake-13.0.6/exe/rake:27:in `<top (required)>'
Tasks: TOP => db:schema:dump
(See full trace by running task with --trace)

经过测试，兼容Redmine-4.1.x的版本在Redmine-4.2上可以正常使用。

请问此插件是否不兼容redmine 4.2版本

以下问题解决了吗？

兼容性问题
目前，这个插件与scrum插件不兼容，这是一个常见的库

确保插件文件夹名称是“redmine_issues_tree",另外，你的redmine的版本是什么，都安装了哪些插件呢？

redmine系统是采用bitnami的虚拟机镜像安装，插件解压后拷贝到apps/redmine/htdocs/plugins下，重启系统报错。
报错信息如下：
We’re sorry, but something went wrong.
The issue has been logged for investigation. Please try again later.

Technical details for the administrator of this website
Error ID:
422a7a28
Details:
Web application could not be started by the Phusion Passenger application server.

Please read the Passenger log file (search for the Error ID) to find the details of the error.

You can also get a detailed report to appear directly on this page, but for security reasons it is only provided if Phusion Passenger is run with environment set to development and/or with the friendly error pages option set to on.

For more information about configuring environment and friendly error pages, see:

Nginx integration mode
Apache integration mode
Standalone mode
This website is powered by Phusion Passenger®, the smart application server built by Phusion®.

redmine系统是采用bitnami的虚拟机镜像安装，插件解压后拷贝到apps/redmine/htdocs/plugins下，重启系统报错。

与a common libs冲突的问题如何解决？