Kaltura_Client_Exception thrown

Invalid KS "MDBkMzY5OTM2MWNjMzg4NmQ3N2IwYzQ2NWRkOWE0MmM5MTExMTllM3wxMDE7OzE0NzUwMjk1NDA7MjsxNDc0OTQzMTQwLjQ1MjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"