Kaltura_Client_Exception thrown

Invalid KS "OTQyYTAwODRlOTJjMTdlNTVjZTg3MzJjYzU5MTU5YjIzZDAyNjg2NnwxMDE7OzE0OTMwMjgyMzQ7MjsxNDkyOTQxODM0LjU2MTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"