Kaltura_Client_Exception thrown

Invalid KS "Y2ZjZjJkMzk2YmVjZDUyNTlmY2M1YTdkMmM4NjBiNjM2MzM1MzY0N3wxMDE7OzE0NzUxOTQ3NTA7MjsxNDc1MTA4MzUwLjcxMTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"