Fatal Error with sendgrid

[azure-architect]

Mautic Version

4.3.x series

PHP version

7.4.30

What browsers are you seeing the problem on?

Not relevant

What happened?

A bug happened! I am getting this error in my system log :
Fatal error: Uncaught Error: Interface 'JsonSerializable' not found in /web/vendor/sendgrid/sendgrid/lib/helpers/mail/Mail.php:15
Stack trace:
#0 /web/vendor/composer/autoload_real.php(55): require()
#1 /web/vendor/composer/autoload_real.php(38): composerRequirefcf81358727006a9595bdc8216684a1c('9dda55337a76a24...', '/web/vendor/com...')
#2 /web/vendor/autoload.php(12): ComposerAutoloaderInitfcf81358727006a9595bdc8216684a1c::getLoader()
#3 /web/autoload.php(3): require('/web/vendor/aut...')
#4 /web/bin/console(21): require_once('/web/autoload.p...')
#5 {main}
thrown in /web/vendor/sendgrid/sendgrid/lib/helpers/mail/Mail.php on line 15

How can we reproduce this issue?

Step 1: This is a standard install on a stand alone vps with no other software co existing with it.

Relevant log output

Fatal error: Uncaught Error: Interface 'JsonSerializable' not found in /web/vendor/sendgrid/sendgrid/lib/helpers/mail/Mail.php:15
Stack trace:
#0 /web/vendor/composer/autoload_real.php(55): require()
#1 /web/vendor/composer/autoload_real.php(38): composerRequirefcf81358727006a9595bdc8216684a1c('9dda55337a76a24...', '/web/vendor/com...')
#2 /web/vendor/autoload.php(12): ComposerAutoloaderInitfcf81358727006a9595bdc8216684a1c::getLoader()
#3 /web/autoload.php(3): require('/web/vendor/aut...')
#4 /web/bin/console(21): require_once('/web/autoload.p...')
#5 {main}
  thrown in /web/vendor/sendgrid/sendgrid/lib/helpers/mail/Mail.php on line 15

Code of Conduct

• I confirm that I have read and agree to follow this project's Code of Conduct

[azure-architect]

Json is enabled in my php.ini

json

json support	enabled

[mautibot]

This issue has been mentioned on Mautic Community Forums. There might be relevant details there:

https://forum.mautic.org/t/fatal-error-uncaught-error-interface-jsonserializable/24731/2

[stale]

This issue or PR has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you would like to keep it open please let us know by replying and confirming that this is still relevant to the latest version of Mautic and we will try to get to it as soon as we can. Thank you for your contributions.

[stale]

This issue or PR has been automatically closed because it has not had recent activity. In the case of issues, if it persists in the latest version of Mautic, please create a new issue and link back to this one for reference. With PRs if you wish to pick up the PR and update it so that it can be considered for a future release, please comment and we will re-open it. Thank you for your contributions.

[github-actions]

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