Kaltura_Client_Exception thrown

Invalid KS "ZmMwYTdmMmJmNGNhYWIxYzk3ZDdhNGIwOGNmNzlkMTVkOTVkNGYwZXwxMDE7OzE0NzQ4NjM2NDA7MjsxNDc0Nzc3MjQwLjg0MTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"