from front end click the upload button for edocman and I get the following error page

0 Call to undefined method Joomla\CMS\Document\HtmlDocument::getWebAssetManager()

if I turn on debugging:

Call stack

Function Location

1 () JROOT/plugins/system/helixultimate/overrides/layouts/joomla/tinymce/textarea.php:15 2 require() JROOT/templates/shaper_helixultimate/html/layouts/joomla/tinymce/textarea.php:11 3 include() JROOT/libraries/src/Layout/FileLayout.php:125 4 Joomla\CMS\Layout\FileLayout->render() JROOT/libraries/src/Layout/LayoutHelper.php:73 5 Joomla\CMS\Layout\LayoutHelper::render() JROOT/plugins/editors/tinymce/tinymce.php:200 6 PlgEditorTinymce->onDisplay() JROOT/libraries/joomla/event/event.php:70 7 JEvent->update() JROOT/libraries/src/Editor/Editor.php:326 8 Joomla\CMS\Editor\Editor->display() JROOT/libraries/src/Form/Field/EditorField.php:256 9 Joomla\CMS\Form\Field\EditorField->getInput() JROOT/libraries/src/Form/FormField.php:425 10 Joomla\CMS\Form\FormField->get() JROOT/libraries/joomla/form/fields/textarea.php:80 11 JFormFieldTextarea->get() JROOT/libraries/src/Form/Field/EditorField.php:131 12 Joomla\CMS\Form\Field\EditorField->__get() JROOT/libraries/src/Form/Form.php:550 13 Joomla\CMS\Form\Form->getInput() JROOT/components/com_edocman/view/document/tmpl/simple.php:152 14 include() JROOT/administrator/components/com_edocman/libraries/rad/view/html.php:207 15 OSViewHtml->render() JROOT/administrator/components/com_edocman/libraries/rad/view/html.php:113 16 OSViewHtml->display() JROOT/components/com_edocman/view/document/html.php:449 17 EDocmanViewDocumentHtml->_displayForm() JROOT/components/com_edocman/view/document/html.php:25 18 EDocmanViewDocumentHtml->display() JROOT/administrator/components/com_edocman/libraries/rad/controller/controller.php:363 19 OSController->display() JROOT/components/com_edocman/controller/controller.php:50 20 EDocmanController->display() JROOT/administrator/components/com_edocman/libraries/rad/controller/controller.php:301 21 OSController->execute() JROOT/components/com_edocman/edocman.php:39 22 require_once() JROOT/libraries/src/Component/ComponentHelper.php:402 23 Joomla\CMS\Component\ComponentHelper::executeComponent() JROOT/libraries/src/Component/ComponentHelper.php:377 24 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:194 25 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:233 26 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:225 27 Joomla\CMS\Application\CMSApplication->execute() JROOT/index.php:49

if I switch to default theme upload works.