Kaltura_Client_Exception thrown

Invalid KS "ZDI4MDhlM2I2ZTJiYWM0NDJiZmIwOTVlNGE1NjBmODNkNGQ5MWU4MXwxMDE7OzE0OTU2NDUyMzE7MjsxNDk1NTU4ODMxLjQxNTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"