The forum is in read only mode.
Users don't getlost password verification mail, while all other system mails arrive?
The reset password is not sent by Jomsocial its from Joomla,
Also, your site has an error in database:
You can try the suggestion below to fix it and raise the issue on Joomla forum if its still same after applying fix
For DB error you can also ask your hosting provider to check and fix it.
Hope it helps.
JomSocial is the most complete, easy-to-use addon that turns Joomla CMS into a full -fledged, social networking site