Hello I have same error
Error #0:
OMV\Exception: Failed to open include file 'js/omv/window/Login.js'. in /usr/share/php/openmediavault/controlpanel/controlpanelabstract.inc:42
Stack trace:
#0 /usr/share/php/openmediavault/controlpanel/login.inc(27): OMV\ControlPanel\ControlPanelAbstract->scanFiles('js/omv/window/L...', Array)
#1 /usr/share/php/openmediavault/controlpanel/controlpanelabstract.inc(206): OMV\ControlPanel\Login->getJavascriptIncludes()
#2 /var/www/openmediavault/index.php(46): OMV\ControlPanel\ControlPanelAbstract->render()
#3 {main}