See below for php server info. Site is test forum under directory /xf-test and currently not live.
Error only occurs in forum enabled to tweet when attempting to create a new thread.
Xenforo: 2.2.7 Patch 1
DragonByte Tweet Poster: 1.2.2 (branding option)

Thanks for your time.
Error only occurs in forum enabled to tweet when attempting to create a new thread.
Xenforo: 2.2.7 Patch 1
DragonByte Tweet Poster: 1.2.2 (branding option)
Stack trace
#0 src/vendor/composer/ClassLoader.php(346): Composer\Autoload\includeFile('/home/debatepo/...')
#1 [internal function]: Composer\Autoload\ClassLoader->loadClass('Abraham\\Twitter...')
#2 src/addons/DBTech/TweetPoster/XF/Service/Thread/Creator.php(80): spl_autoload_call('Abraham\\Twitter...')
#3 src/XF/Service/ValidateAndSavableTrait.php(42): DBTech\TweetPoster\XF\Service\Thread\Creator->_save()
#4 src/XF/Pub/Controller/Forum.php(919): XF\Service\Thread\Creator->save()
#5 src/addons/XenConcept/AdvancedForumRules/XF/Pub/Controller/Forum.php(59): XF\Pub\Controller\Forum->actionPostThread(Object(XF\Mvc\ParameterBag))
#6 src/XF/Mvc/Dispatcher.php(352): XenConcept\AdvancedForumRules\XF\Pub\Controller\Forum->actionPostThread(Object(XF\Mvc\ParameterBag))
#7 src/XF/Mvc/Dispatcher.php(263): XF\Mvc\Dispatcher->dispatchClass('XF:Forum', 'PostThread', Object(XF\Mvc\RouteMatch), Object(SV\OptimizedListQueries\XF\Pub\Controller\Forum), NULL)
#8 src/XF/Mvc/Dispatcher.php(115): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(SV\OptimizedListQueries\XF\Pub\Controller\Forum), NULL)
#9 src/XF/Mvc/Dispatcher.php(57): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#10 src/XF/App.php(2345): XF\Mvc\Dispatcher->run()
#11 src/XF.php(512): XF\App->run()
#12 index.php(20): XF::runApp('XF\\Pub\\App')
#13 {main}
Request state
array(4) {
["url"] => string(55) "/xf-test/forums/announcements-forum-news.12/post-thread"
["referrer"] => string(85) "https://www.debatepolitics.com/xf-test/forums/announcements-forum-news.12/post-thread"
["_GET"] => array(0) {
}
["_POST"] => array(12) {
["title"] => string(36) "Testing Twitter feed - please ignore"
["discussion_type"] => string(10) "discussion"
["message_html"] => string(14) "<p>Thanks!</p>"
["attachment_hash"] => string(32) "2b3235ffa42155b7580a698a159751ba"
["attachment_hash_combined"] => string(82) "{"type":"post","context":{"node_id":12},"hash":"2b3235ffa42155b7580a698a159751ba"}"
["watch_thread"] => string(1) "1"
["_xfSet"] => array(3) {
["watch_thread"] => string(1) "1"
["discussion_open"] => string(1) "1"
["sticky"] => string(1) "1"
}
["discussion_open"] => string(1) "1"
["_xfToken"] => string(8) "********"
["_xfRequestUri"] => string(55) "/xf-test/forums/announcements-forum-news.12/post-thread"
["_xfWithData"] => string(1) "1"
["_xfResponseType"] => string(4) "json"
}
}

Thanks for your time.