Kaltura_Client_Exception thrown

Invalid KS "Y2M5NTk3YjdmYzk3Y2YyYzg0NGRjZmFmMDRjODk4NzQzNTE1MzE3NXwxMDE7OzE0NzUzNjAwNTI7MjsxNDc1MjczNjUyLjU4MTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"