Kaltura_Client_Exception thrown

Invalid KS "YTE5ODVhODkzYTFjZDlhZjE5ZDVmOTI0YjM5NWFkMzk5ZTA2ZTExZXwxMDE7OzE0NzUxNjQ0NTk7MjsxNDc1MDc4MDU5LjUwNjg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"