Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

error 18

  • 3 ŋuɖoɖowo
  • 1 masɔmasɔ sia le esi
  • 1 view
  • Nuɖoɖo mlɔetɔ cor-el

more options

In BT Yahoo error 18 appears when trying to apply attachments to e-mails, how do I resolve this issue?

In BT Yahoo error 18 appears when trying to apply attachments to e-mails, how do I resolve this issue?

All Replies (3)

more options

hi, please try to clear the cache & cookies from yahoo.com and reload the page.

more options

Hi Philipp, I've cleared the cache & cookies but I still can't attach anything to an e-mail.

more options

You can check if your plugins are up-to-date.

Your System Detail list shows an older Shockwave Flash 11.8 r800 version. You can find the latest Flash player versions for Firefox on this page:


It is possible that security (Anti-Virus, firewall) is causing problems. Try to disable security software temporarily to see if that makes a difference.