Kaltura_Client_Exception thrown

Invalid KS "ZTU1NTgzNmJhYzEzNDM1NDA0OTM3NTU5MGY5ZWFiMjdmM2ZmZTM3MXwxMDE7OzE0NzUyMDAyNzM7MjsxNDc1MTEzODczLjk1ODE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"