Warning: DOMDocument::loadXML(): Namespace prefix font-style for normal on span is not defined in Entity, line: 49 in /var/www/html/zangdiyg/ti/epub/EPub.php on line 736

Error: Unable to send file སྤྱིའི་དེབ་17པ།.epub. Output buffer contains the following text (typically warnings or errors):
<br /> <b>Warning</b>: DOMDocument::loadXML(): Namespace prefix font-style for normal on span is not defined in Entity, line: 49 in <b>/var/www/html/zangdiyg/ti/epub/EPub.php</b> on line <b>736</b><br />