Kaltura_Client_Exception thrown

Invalid KS "YzI2NzA2NjY4MWRiMzNmZjM1MjQ5NmUyNzY0NGUwYzViYWU0OWRlM3wxMDE7OzE0NzUyOTg3NDg7MjsxNDc1MjEyMzQ4LjA3NTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"