Kaltura_Client_Exception thrown

Invalid KS "M2U0ZTVjNWJiYTg5NjMyNDI5YjI3Y2RjNmU4YWYyZDYwYjcyODQ4Y3wxMDE7OzE0ODQ4MTQ4MDA7MjsxNDg0NzI4NDAwLjU3MzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"