problems with 1.2.0

hi
just made the update to 1.20. and got this error message:

Fatal error: Cannot access protected property SchemaFront::$Settings in /var/home/m-sendlhofer_at/www/wp-content/plugins/schema-app-structured-data-for-schemaorg/hunch-schema.php on line 27

when i disable the plugin, the site is working.
wp version: 4.6.1.

thank you