I'm running 3.9.11.
I've disabled all the form fields and the error returns when any one of them are enabled. It pretty much returns on any page that loads anything from CE. I've attached a csv of the fields for one of the forms.
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Debug details on the error:
Joomla\CMS\Form\Form::removeField `xml` is not an instance of SimpleXMLElement
/var/www/vhosts/new.pioneerlibrarysystem.org/libraries/src/Form/Form.php:877
Call stack
# Function Location
1 () JROOT/libraries/src/Form/Form.php:877
2 Joomla\CMS\Form\Form->removeField() JROOT/plugins/system/trackactions/trackactions.php:911
3 PlgSystemTrackActions->onContentPrepareForm() JROOT/libraries/joomla/event/event.php:70
4 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:160
5 JEventDispatcher->trigger() JROOT/libraries/src/Application/BaseApplication.php:108
6 Joomla\CMS\Application\BaseApplication->triggerEvent() JROOT/components/com_contactenhanced/models/contact.php:299
7 ContactenhancedModelContact->getContactQuery() JROOT/components/com_contactenhanced/models/contact.php:165
8 ContactenhancedModelContact->getItem() JROOT/libraries/src/MVC/View/HtmlView.php:425
9 Joomla\CMS\MVC\View\HtmlView->get() JROOT/components/com_contactenhanced/views/contact/view.html.php:39
10 ContactenhancedViewContact->display() JROOT/libraries/src/MVC/Controller/BaseController.php:672
11 Joomla\CMS\MVC\Controller\BaseController->display() JROOT/components/com_contactenhanced/controller.php:286
12 ContactenhancedController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:710
13 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_contactenhanced/contactenhanced.php:51
14 require_once() JROOT/libraries/src/Component/ComponentHelper.php:402
15 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377
16 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194
17 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233
18 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:196
19 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49