I am currently experiencing issues connecting OpenProject to Slack. Below are the steps I followed:

1. Creating Gemfile.plugins:

   group :opf_plugins do
     gem "openproject-slack", git: "https://github.com/opf/openproject-slack.git", branch: "dev"
   end

2. Creating Dockerfile:

   FROM openproject/openproject:14 AS plugin

   # If installing a local plugin (using `path:` in the `Gemfile.plugins` above),
   # you will have to copy the plugin code into the container here and use the
   # path inside of the container. For example, for `/app/vendor/plugins/openproject-slack`:
   # COPY /path/to/my/local/openproject-slack /app/vendor/plugins/openproject-slack

   COPY Gemfile.plugins /app/

   # If the plugin uses any external NPM dependencies, install them here.
   # RUN npm add <package-name>*

   RUN bundle config unset deployment && bundle install && bundle config set deployment 'true'
   RUN ./docker/prod/setup/precompile-assets.sh

   FROM openproject/openproject:14-slim

   COPY --from=plugin /usr/bin/git /usr/bin/git
   COPY --chown=$APP_USER:$APP_USER --from=plugin /app/vendor/bundle /app/vendor/bundle
   COPY --chown=$APP_USER:$APP_USER --from=plugin /usr/local/bundle /usr/local/bundle
   COPY --chown=$APP_USER:$APP_USER --from=plugin /app/public/assets /app/public/assets
   COPY --chown=$APP_USER:$APP_USER --from=plugin /app/config/frontend_assets.manifest.json /app/config/frontend_assets.manifest.json
   COPY --chown=$APP_USER:$APP_USER --from=plugin /app/Gemfile.* /app/

3. Using Docker Build:

docker build --pull -t openproject-with-slack.1 . --no-cache

4. Removing Old Containers:

docker image prune --all

5. Running OpenProject:

docker-compose up -d

While attempting to use the Slack plugin at `/admin/settings/plugin/openproject_slack`, I encountered the following error:

[Error 500] An error occurred on the page you were trying to access. If you continue to experience problems, please contact your OpenProject administrator for assistance.

I haven't found any logs that indicate the root cause of the issue. I would appreciate your support.