Kaltura_Client_Exception thrown

Invalid KS "MjA3NGMxNDM4MWI3MGNjOGViMGNjYzkyNjI5MzA5MDBkM2FiOTk3ZnwxMDE7OzE0OTMwNjQ1MDI7MjsxNDkyOTc4MTAyLjQyOTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"