Hello, my Community Builder registration process seems to have started failing since I updated CiviCRM recently.
Users can enter their data on the registration form, but "Submit" generates a 500 error page, and the above error.  The Joomla user is created, but not the Community Builder entry, and no email notifications are sent.I guess there are two versions of GuzzleHttp conflicting but I'm not sure how I go about resolving this. This maybe isn't specifically a Community Builder problem, but I'd very much appreciate some guidance on how to troubleshoot this!

I think all versions are up-to-date:
Joomla 3.10.10
CiviCRM 5.50.2
Community Builder 2.7.3 (all plugins also show as current)

Thanks!

Update: had this information from the CiviCRM forums:

"In this specific case, my guess is that community builder is using guzzle 7 (the source code for community builder doesn't seem available online to check???). If that's true, then since civi supports guzzle 7 but just ships with guzzle 6, what you can try is go into the civicrm plugin folder and runso that they end up with the same version. If something goes wrong justto restore the old guzzle for civi."

Does this make sense? Can someone confirm the Guzzle version for CB, or have other insights?
 

Great, thanks for the confirmation.  Since CiviCRM will support Guzzle 7, I'll do as they suggest and update the dependencies inside their plugin.

Just might want to keep this on your radar in case other Civi users come across it