Kaltura_Client_Exception thrown

Invalid KS "MzdlOGZiNWE3MDljYjc5Yzc3YTJmZjAwZjE5MWI5ZjQ3M2UyOTA5M3wxMDE7OzE0ODE0MTMxMDY7MjsxNDgxMzI2NzA2LjI1Mzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"