Kaltura_Client_Exception thrown

Invalid KS "NjkxMjM3MWEzZDk3Zjg0N2IwMWFkNDhiZjdkYjY5NDk4YTgwNDZmOXwxMDE7OzE0NzAwMjM2MTk7MjsxNDY5OTM3MjE5LjE0NzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"