Kaltura_Client_Exception thrown

Invalid KS "MjAzMmUyOTBhOTU5YWNiNTE4ZDUzMzIyOWYzMjEyYmMwNTYyMmNkOHwxMDE7OzE1MDEwODgwMTA7MjsxNTAxMDAxNjEwLjEwNTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"