My b2evolution Version: Not Entered

Hi all, I've been implementing a couple of hacks suggested by kind members of this community and, well, I don't know what I've broken, but now, every time I comment on my own blog, I get this errors:

Warning: Missing argument 4 for send_mail(), called in /home/bit/public_html/blog/plugins/am_subscriptions_plugin/_am_subscriptions.plugin.php on line 379 and defined in /home/bit/public_html/blog/inc/_core/_misc.funcs.php on line 2208

Notice: Undefined variable: message in /home/bit/public_html/blog/inc/_core/_misc.funcs.php on line 2244

Warning: Cannot modify header information - headers already sent by (output started at /home/bit/public_html/blog/inc/_core/_misc.funcs.php:2208) in /home/bit/public_html/blog/inc/_core/_template.funcs.php on line 192

Warning: Cannot modify header information - headers already sent by (output started at /home/bit/public_html/blog/inc/_core/_misc.funcs.php:2208) in /home/bit/public_html/blog/inc/_core/_template.funcs.php on line 193

Warning: Cannot modify header information - headers already sent by (output started at /home/bit/public_html/blog/inc/_core/_misc.funcs.php:2208) in /home/bit/public_html/blog/inc/_core/_template.funcs.php on line 194

Warning: Cannot modify header information - headers already sent by (output started at /home/bit/public_html/blog/inc/_core/_misc.funcs.php:2208) in /home/bit/public_html/blog/inc/_core/_template.funcs.php on line 195

Warning: Cannot modify header information - headers already sent by (output started at /home/bit/public_html/blog/inc/_core/_misc.funcs.php:2208) in /home/bit/public_html/blog/inc/_core/_template.funcs.php on line 174

Warning: Cannot modify header information - headers already sent by (output started at /home/bit/public_html/blog/inc/_core/_misc.funcs.php:2208) in /home/bit/public_html/blog/inc/_core/_template.funcs.php on line 182

I don't know why it gives a reference to send_mail(), because I didn't click on the option to subscribe to comments (I am the blog owner and receive those mails anyway), so... (sigh)

I have modified the skin to have my own comments highlighted (as per Yabba's instructions at http://forums.b2evolution.net/viewtopic.php?t=19246 ), but that doesn't seem to have anything to do with this error.

Oh, I forgot to mention this: As frightening as the error may seem, the comment gets posted, anyway.