Kaltura_Client_Exception thrown

Invalid KS "NDY1YjUyYTUwNTJiZWQ2NWQ5ZTQyOWEyZDQyYjI0OWJhZDQxYzlkZXwxMDE7OzE0OTgyMjA3Mzg7MjsxNDk4MTM0MzM4LjY0OTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"