Kaltura_Client_Exception thrown

Invalid KS "NGJkNGYxM2E1MDMyMTBmNmQ2ZmQ0ZDQxMDk3ZTY0NDYwZDFlZDk2NHwxMDE7OzE0NzUyMTkwOTk7MjsxNDc1MTMyNjk5Ljg1MDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"