P2 – Comment won’t post via AJax

When visitors try to post a comment on my blog with the P2 theme, the wheel will keep going and nothing will happen. This is the HTTP request that shows showing there is a 500 error. I reuploaded the theme, disabled plugins, turn off moderation of comments and nothing seems to help.

Here is the RAW request:
Raw request
POST /sideblog/?p2ajax HTTP/1.1
User-Agent: Opera/9.80 (Macintosh; Intel Mac OS X; U; en) Presto/2.5.24 Version/10.52
Host: chikorita157.notcliche.com
Accept-Language: en,en-US;q=0.9,ja;q=0.8,fr;q=0.7,de;q=0.6,es;q=0.5,it;q=0.4,pt;q=0.3,pt-PT;q=0.2,nl;q=0.1,sv;q=0.1,nb;q=0.1,da;q=0.1,fi;q=0.1,ru;q=0.1,pl;q=0.1,zh-CN;q=0.1,zh-TW;q=0.1,ko;q=0.1
Accept-Charset: iso-8859-1, utf-8, utf-16, *;q=0.1
Accept-Encoding: deflate, gzip, x-gzip, identity, *;q=0
Referer: https://chikorita157.notcliche.com/sideblog/
Cookie: wp-settings-1=editor%3Dtinymce%26urlbutton%3Durlfile%26imgsize%3Dmedium%26m0%3Do%26m1%3Do%26m2%3Dc%26m3%3Dc%26m4%3Dc%26m5%3Dc%26m6%3Do%26m7%3Do%26m8%3Dc%26hidetb%3D1%26m9%3Dc%26m10%3Dc%26m11%3Dc%26m12%3Dc%26m13%3Dc%26align%3Dcenter; wp-settings-time-1=1272390363; comment_author_76622cd6563c377432ce4f2f9b187ee0=chikorita157; comment_author_email_76622cd6563c377432ce4f2f9b187ee0=chikorita157%40optonline.net; bb2_screener_=1272410961+69.125.188.189; wordpress_test_cookie=WP+Cookie+check; PHPSESSID=64c23e6f3832faaf0de150dffc3c85b0
Cookie2: $Version=1
Connection: Keep-Alive, TE
TE: deflate, gzip, chunked, identity, trailers
Content-Length: 169
Content-Type: application/x-www-form-urlencoded
X-Requested-With: XMLHttpRequest
Accept: */*
Content-Transfer-Encoding: binary

Raw response
HTTP/1.1 500 Internal Server Error
Date: Tue, 27 Apr 2010 23:47:17 GMT
Server: Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4
X-Powered-By: PHP/5.2.13
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Cache-Control: no-cache, must-revalidate, max-age=0
Pragma: no-cache
Last-Modified: Tue, 27 Apr 2010 23:47:18 GMT
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html; charset=utf-8

Edit: I figured it out. It is the OpenID plugin that is causing the problem.

Blog in question: https://chikorita157.notcliche.com/sideblog/