Unsolved Installing a Discourse Plugin on Cloudron

[LoudLemur]

I am having trouble installing the discourse-calendar plugin.
https://docs.cloudron.io/apps/discourse/#installing-plugins

After entering cd /app/code there is an error message:

 cd /app/code
Traceback (most recent call last):
SyntaxError ((irb):7: unknown regexp options - cd)
cd /app/code
       ^~~~~

If this message is ignored, what should the following line be?

a) ```
bundle exec rake plugin:install_gems['discourse-calendar']

b) ```
bundle exec rake plugin:install_gems[discourse-calendar]

c) ```
bundle exec rake plugin:install_gemsdiscourse-calendar

d) ```
bundle exec rake plugin:install_gems discourse-calendar

e) ```
bundle exec rake plugin:install_gems ['discourse-calendar ']

!

[msbt]

@LoudLemur you might want to check your comments/codeblocks, not easy to identify Could be many things that happened here, a space that doesn't belong, a missing ' there, are you even in the right directory?