I have installed and used the Contact Form Extensions plugin a few times but this time it's not working. I can see it in the CP but when I click to install it throws the error:

Invalid plugin – craft\errors\InvalidPluginException 'No plugin exists with the handle "contact-form-extensions".'

When I install it the command line does say something about Carbon 1 being deprecated but not sure if it's related?

1 Answer 1


Try running ./craft project-config/rebuild from your terminal.

  • Yes that fixed it! No idea why - thanks Oli Commented Jun 7, 2019 at 10:53
  • Oli for some reason doing that seems to have massively sped up how fast my local version loads both in CP and website - not sure why but thanks! Commented Jun 7, 2019 at 10:59
  • We all love of bit of speed ;)
    – Oli
    Commented Jun 7, 2019 at 12:34
  • fantastic... saved the day (or a few hours at least). can you also give an explanation why this is happening?
    – tom
    Commented Jun 20, 2019 at 7:36

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