Kaltura_Client_Exception thrown

Invalid KS "MDA1MWQxYTAwZmU4MGUyOWRkNWY0NGM3MTZhMDNiOWI2OTM4MTBkMXwxMDE7OzE0NzUyMTg2MTM7MjsxNDc1MTMyMjEzLjIzMTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"