Kaltura_Client_Exception thrown

Invalid KS "NjJlMWY1ODNmNDBkYzE0ZDg3YjcwMjc2OTM4ZWEwZWJiYWM3MzNlNXwxMDE7OzE0NzQ5NDM4OTA7MjsxNDc0ODU3NDkwLjc1NzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"