@AddonFlare here is the error I am encountering:
LogicException: Unknown relation or alias PaidRegistrationsAccountType accessed on xf_user_upgrade in src/XF/Mvc/Entity/Finder.php:768
Stack trace
#0 src/XF/Mvc/Entity/Finder.php(664): XF\Mvc\Entity\Finder->join('PaidRegistratio...', true, false, false)
#1 src/addons/AddonFlare/PaidRegistrations/XF/Repository/UserUpgrade.php(14): XF\Mvc\Entity\Finder->with('PaidRegistratio...')
#2 src/XF/Repository/UserUpgrade.php(53): AddonFlare\PaidRegistrations\XF\Repository\UserUpgrade->findUserUpgradesForList()
#3 src/XF/Pub/Controller/Account.php(1242): XF\Repository\UserUpgrade->getFilteredUserUpgradesForList()
#4 src/addons/AddonFlare/PaidRegistrations/XF/Pub/Controller/Account.php(13): XF\Pub\Controller\Account->actionUpgrades()
#5 src/XF/Mvc/Dispatcher.php(352): AddonFlare\PaidRegistrations\XF\Pub\Controller\Account->actionUpgrades(Object(XF\Mvc\ParameterBag))
#6 src/XF/Mvc/Dispatcher.php(259): XF\Mvc\Dispatcher->dispatchClass('XF:Account', 'Upgrades', Object(XF\Mvc\RouteMatch), Object(AddonFlare\PaidRegistrations\XF\Pub\Controller\Account), NULL)
#7 src/XF/Mvc/Dispatcher.php(115): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(AddonFlare\PaidRegistrations\XF\Pub\Controller\Account), NULL)
#8 src/XF/Mvc/Dispatcher.php(57): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#9 src/XF/App.php(2487): XF\Mvc\Dispatcher->run()
#10 src/XF.php(524): XF\App->run()
#11 index.php(20): XF::runApp('XF\\Pub\\App')
#12 {main}
My users report that they cannot purchase an account upgrade anymore as they encounter the message
Oops! We ran into some problems.
A server error has occurred. Please try again later.
Running XF 2.2.13