Kaltura_Client_Exception thrown

Invalid KS "ZjMzM2Y5NjQ4MTNjNDczMjBiODJjMGNhOWQ5MjNlMmI5MmVlZmUzZHwxMDE7OzE0NzQ4MzgxNDM7MjsxNDc0NzUxNzQzLjE4NDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"