Kaltura_Client_Exception thrown

Invalid KS "NjkxMmZlYTliOTc4NmM3MTNkMGM0YjQxNjYxNjVlNjA2M2M2YzVjYXwxMDE7OzE0NzUwNTkyMzQ7MjsxNDc0OTcyODM0LjEzMTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"