Class does not have a constructor

Environment: PostgreSQL 7.2.2 on FreeBSD 4.6 with PHP 5.0.0; Apache 1.3.26

Application: Moodle 1.3.3

Error message: [class]: class does not have a constructor

Narrative:

I'm running this e-learning application and getting the error message above.
Have queried other application users who say they are running the same
application against MySQL, Apache 1.3.x, PHP 5.0.0 on Linux without error.
Others running against PostgreSQL also without error.

I'm wondering whether my PostgreSQL implementation/configuration is causing
this problem? Any thoughts?

Note: Have also tried with PostgreSQL 7.43 via Apache 2.0 and received the
same error...have queried PHP 5.0.0 users who say the changes from last
version to this should not have affected this...

Thanks!