wp-openid Call to undefined function: error()

I was able to submit one openID enabled comment with my newly-installed wp-openid 2.1.8 plugin.

Now, I get this error:
Fatal error: Call to undefined function: error() in /home/content/f/a/s/fastwonderblog/html/wp-content/plugins/openid/store.php on line 134

After looking at line 134, it looks like it is having issues with this error:
$this->core->log->error(‘unable to add column openid to comments table.’);

I tried commenting out the error to rule out an issue with the error message itself, but as expected no luck.

I’ve deactivated the plugin for now. Any help would be appreciated.

Details:
Hosted at GoDaddy (I know, not the best choice)
Wordpress 2.5.1
K2 1.0-RC6 (with live commenting disabled)

Status information: All Systems Nominal (Toggle More/Less)

[INFO] Include Path
/home/content/f/a/s/fastwonderblog/html/wp-content/plugins/openid/
/usr/local/lib/php/
[INFO] WordPress version
2.5.1
[INFO] MySQL version
5.0.18
[INFO] PHP version
4.3.11
[INFO] PHP memory limit
[OK] Curl Version l. SSL: l. zlib: l. Supports: l.
[FAIL] library: GMP compiled into in PHP
GMP does not appear to be built into PHP. This is highly recommended for performance reasons.
[OK] library: BCMath compiled into in PHP
[INFO] Cryptographic Randomness Source
/dev/urandom
[INFO] Plugin Revision
svn-37878
[INFO] Plugin Database Revision
Plugin database is currently at revision 24426.
[OK] Overall Plugin Status