Clicking workflows as a non-admin generates a page error

[jmcgaha]

Error: Class 'therefinery\lynnworkflow\controllers\HttpException' not found in /chroot/home/lynnedu/3.lynn.edu/vendor/therefinery/lynnworkflow/src/controllers/WorkflowsController.php:30

Stack trace:

#0 [internal function]: therefinery\lynnworkflow\controllers\WorkflowsController->actionList()

#1 /chroot/home/lynnedu/3.lynn.edu/vendor/yiisoft/yii2/base/InlineAction.php(57): call_user_func_array(Array, Array)

#2 /chroot/home/lynnedu/3.lynn.edu/vendor/yiisoft/yii2/base/Controller.php(157): yii\base\InlineAction->runWithParams(Array)

#3 /chroot/home/lynnedu/3.lynn.edu/vendor/craftcms/cms/src/web/Controller.php(103): yii\base\Controller->runAction('list', Array)

#4 /chroot/home/lynnedu/3.lynn.edu/vendor/yiisoft/yii2/base/Module.php(528): craft\web\Controller->runAction('list', Array)

#5 /chroot/home/lynnedu/3.lynn.edu/vendor/craftcms/cms/src/web/Application.php(282): yii\base\Module->runAction('lynnworkflow/wo...', Array)

#6 /chroot/home/lynnedu/3.lynn.edu/vendor/yiisoft/yii2/web/Application.php(103): craft\web\Application->runAction('lynnworkflow/wo...', Array)

#7 /chroot/home/lynnedu/3.lynn.edu/vendor/craftcms/cms/src/web/Application.php(271): yii\web\Application->handleRequest(Object(craft\web\Request))

#8 /chroot/home/lynnedu/3.lynn.edu/vendor/yiisoft/yii2/base/Application.php(386): craft\web\Application->handleRequest(Object(craft\web\Request))

#9 /chroot/home/lynnedu/3.lynn.edu/html/index.php(21): yii\base\Application->run()

#10 {main}