Kaltura_Client_Exception thrown

Invalid KS "NjRlZmEzNmM3MDIwOTU1OGNlNzZlNDM4ZjFlMjlhY2FmOTRiZGRlOHwxMDE7OzE0NzUyMTk2ODk7MjsxNDc1MTMzMjg5LjM2NzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"