An error has occurred. 0 Call to undefined function vmError()

[daddio]

Running Joomla! 3.9.18 and VirtueMart 3.8.2 10325.
Any article I try to save gives me the error. It will save my content but still dumps me out of the article and leaves it locked.

Any idea what is causing it?

Backtrace:
/home/singingt/staging/3/administrator/components/com_virtuemart/helpers/vmlanguage.php:267
#0 /home/singingt/staging/3/administrator/components/com_virtuemart/helpers/vmlanguage.php(94): vmLanguage::setLanguage(false, false)
#1 /home/singingt/staging/3/components/com_virtuemart/router.php(948): vmLanguage::setLanguageByTag(false, false, false)
#2 /home/singingt/staging/3/components/com_virtuemart/router.php(371): vmrouterHelper::getInstance()
#3 /home/singingt/staging/3/libraries/src/Component/Router/RouterLegacy.php(105): virtuemartParseRoute(Array)
#4 /home/singingt/staging/3/libraries/src/Router/SiteRouter.php(437): Joomla\CMS\Component\Router\RouterLegacy->parse(Array)
#5 /home/singingt/staging/3/libraries/src/Router/Router.php(482): Joomla\CMS\Router\SiteRouter->parseSefRoute(Object(Joomla\CMS\Uri\Uri))
#6 /home/singingt/staging/3/libraries/src/Router/Router.php(227): Joomla\CMS\Router\Router->_parseSefRoute(Object(Joomla\CMS\Uri\Uri))
#7 /home/singingt/staging/3/libraries/src/Router/SiteRouter.php(138): Joomla\CMS\Router\Router->parse(Object(Joomla\CMS\Uri\Uri))
#8 /home/singingt/staging/3/plugins/content/pingomatic/pingomatic.php(159): Joomla\CMS\Router\SiteRouter->parse(Object(Joomla\CMS\Uri\Uri))
#9 /home/singingt/staging/3/plugins/content/pingomatic/pingomatic.php(197): plgContentPingomatic->findItemidNewRouter('index.php?optio...', Object(Joomla\CMS\Router\SiteRouter))
#10 /home/singingt/staging/3/plugins/content/pingomatic/pingomatic.php(279): plgContentPingomatic->routeArticleToSefMenu(162, '69', '*', Object(Joomla\CMS\Table\Content))

#11 /home/singingt/staging/3/libraries/joomla/event/event.php(70): plgContentPingomatic->onContentAfterSave('com_content.art...', Object(Joomla\CMS\Table\Content), false, Array)
#12 /home/singingt/staging/3/libraries/joomla/event/dispatcher.php(160): JEvent->update(Array)
#13 /home/singingt/staging/3/libraries/src/MVC/Model/AdminModel.php(1292): JEventDispatcher->trigger('oncontentafters...', Array)
#14 /home/singingt/staging/3/administrator/components/com_content/models/article.php(676): Joomla\CMS\MVC\Model\AdminModel->save(Array)
#15 /home/singingt/staging/3/libraries/src/MVC/Controller/FormController.php(775): ContentModelArticle->save(Array)
#16 /home/singingt/staging/3/libraries/src/MVC/Controller/BaseController.php(710): Joomla\CMS\MVC\Controller\FormController->save()
#17 /home/singingt/staging/3/administrator/components/com_content/content.php(21): Joomla\CMS\MVC\Controller\BaseController->execute('apply')
#18 /home/singingt/staging/3/libraries/src/Component/ComponentHelper.php(402): require_once('/home/singingt/...')
#19 /home/singingt/staging/3/libraries/src/Component/ComponentHelper.php(377): Joomla\CMS\Component\ComponentHelper::executeComponent('/home/singingt/...')
#20 /home/singingt/staging/3/libraries/src/Application/AdministratorApplication.php(101): Joomla\CMS\Component\ComponentHelper::renderComponent('com_content')
#21 /home/singingt/staging/3/libraries/src/Application/AdministratorApplication.php(159): Joomla\CMS\Application\AdministratorApplication->dispatch()
#22 /home/singingt/staging/3/libraries/src/Application/CMSApplication.php(196): Joomla\CMS\Application\AdministratorApplication->doExecute()
#23 /home/singingt/staging/3/administrator/index.php(51): Joomla\CMS\Application\CMSApplication->execute()
#24 {main}

[GJC Web Design]

hard to understand why the VM router would be called while saving a Joomla article

Try disabling the plgContentPingomatic  plugin as a test

[daddio]

And that seemed to do the trick. I disabled the plugin and now I can save articles.. 

Thank you GJC!

[GJC Web Design]

try this solution for importing the vm defines into the plgContentPingomatic  plugin

http://forum.virtuemart.net/index.php?topic=144908.msg514062#msg514062