I assume you have been trying the conversion online via web browser? If yes, then you may check with a different web browser than what you are using currently.
If you have any internet security software, turn it off for a while and check back.
[Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install or activate other software, you should re-enable it as soon as you're done.]