Kaltura_Client_Exception thrown

Invalid KS "NDY0YWQ5YWMzZDA1ZTAyMDkzMDEyNzIyMjBlNDhhNmI3NzNjYjRjN3wxMDE7OzE0NzUzMTEwMzY7MjsxNDc1MjI0NjM2LjExMjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"