Can you past here the code you are inserting in the post? I think it will help to understand what’s going on.
Thanks for your reply Anderson
I have tried using the iFrame code:
<iframe width="100%" height="450" scrolling="no" frameborder="no" src="https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Fplaylists%2F5450440"></iframe>
And the WordPress shortcode:
[soundcloud url="http://api.soundcloud.com/playlists/5450440" params="" width=" 100%" height="450" iframe="true" /]
Both come up with the same error, when I submit it goes to an error page, when I remove the embed code, they work fine.
Actually, even if I just enter an empty iFrame tag, it produces an error:
<iframe></iframe>
Thanks for any help!