Kaltura_Client_Exception thrown

Invalid KS "OTZlNTJkODk3Zjk1YjkzNDg4MzQzNDY0YmFmMjJmNDQwZGZmNjRiNnwxMDE7OzE0NjczOTU0NzQ7MjsxNDY3MzA5MDc0LjMxNzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"