Kaltura_Client_Exception thrown

Invalid KS "MjZkNzgzNTU5Yjc5ZDY1MzQ1MTgxMzRiNWY5NTkxZWNlNWVmZTRlN3wxMDE7OzE0OTgzNjg4OTc7MjsxNDk4MjgyNDk3LjI4OTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"