Nextcloud 12 Sensor Logger Internal Error

Hello i just installed the Sensor Logger app and when i click on app icon im getting. Can anyone help?

Internal Server Error
The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log.

Log file
Error PHP Object of class OCP\AppFramework\App could not be converted to string at /var/www/nextcloud/lib/private/legacy/app.php#80 a few seconds ago
Error PHP trim() expects parameter 1 to be string, object given at /var/www/nextcloud/lib/private/legacy/app.php#537 a few seconds ago
Error PHP Illegal offset type in isset or empty at /var/www/nextcloud/lib/private/legacy/app.php#604 a few seconds ago
Error PHP Illegal offset type at /var/www/nextcloud/lib/private/AppConfig.php#212 a few seconds ago
Error PHP Object of class OCP\AppFramework\App could not be converted to string at /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php#67 a few seconds ago
Error PHP Object of class OCP\AppFramework\App could not be converted to string at /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php#91 a few seconds ago
Error PHP Object of class OCP\AppFramework\App could not be converted to string at /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php#91 a few seconds ago
Error PHP Illegal offset type at /var/www/nextcloud/lib/private/AppConfig.php#157 a few seconds ago
Error PHP Illegal offset type in unset at /var/www/nextcloud/lib/private/App/AppManager.php#281 a few seconds ago
Error PHP Object of class OCP\AppFramework\App could not be converted to string at /var/www/nextcloud/lib/private/legacy/app.php#80 a few seconds ago
Error PHP trim() expects parameter 1 to be string, object given at /var/www/nextcloud/lib/private/legacy/app.php#537 a few seconds ago
Error PHP Illegal offset type in isset or empty at /var/www/nextcloud/lib/private/legacy/app.php#604 a few seconds ago
Error no app in context TypeError: Argument 1 passed to OC\NavigationManager::__construct() must implement interface OCP\App\IAppManager, none given, called in /var/www/nextcloud/apps/sensorlogger/lib/App.php on line 19 a few seconds ago