Kaltura_Client_Exception thrown

Invalid KS "NzBlNmRhOTRiMmVlODcxODE3NGY5MzZiYTY0NTQ2NmI0NzFhMzVjZXwxMDE7OzE0NzUxNDU1NTg7MjsxNDc1MDU5MTU4LjUwMTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"