Ad Module Problem - AHAH Error

I keep getting this when I try to select the ad type.

An error occurred.
/node/add/ad/ahah
{ "status": true, "data": "\x3cfieldset class=\" collapsible\"\x3e\x3clegend\x3eHTML\x3c/legend\x3e\x3cdiv class=\"form-item\" id=\"edit-html-wrapper\"\x3e\n \x3clabel for=\"edit-html\"\x3eAd HTML: \x3cspan class=\"form-required\" title=\"This field is required.\"\x3e*\x3c/span\x3e\x3c/label\x3e\n \x3ctextarea cols=\"60\" rows=\"5\" name=\"html\" id=\"edit-html\" class=\"form-textarea resizable required\"\x3e\x3c/textarea\x3e\n \x3cdiv class=\"description\"\x3ePaste the complete HTML provided by your advertising affiliate.\x3c/div\x3e\n\x3c/div\x3e\n\x3c/fieldset\x3e\n" }

When I click "OK" on the above message, no place to put the ad.

I tried the latest and the dev version and I always get the same message.

Thanks in advance for your assistance.