Kaltura_Client_Exception thrown

Invalid KS "NTZjOTgxMjcxMzNmOTdkOGFjNGM1NWMzNWVlOWJkZGEwZDU2MDFkN3wxMDE7OzE0NzUxNjQxMDA7MjsxNDc1MDc3NzAwLjc4OTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"