Page renderer error log entry in Admin module

[FrancisChung]

Hi,

I've noticed the following entries in my PW error log SQLSTATE[HY000]: General error: could not call class constructor [pageClass=Page, template=]

The following is the associated link that is logged as well.

http://localhost:8888/processwire/page/list/?id=id&render=render&start=start〈=lang&open=open&mode=mode

Any ideas where I can look to get to the bottom of this?