Kaltura_Client_Exception thrown

Invalid KS "ZjY1ZDRkMjdkYzBiNDg1YWNkNDkzODY1ODlmYWUyZTM5MzI1MzNkY3wxMDE7OzE0OTA1NTY1NjI7MjsxNDkwNDcwMTYyLjk1OTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"