PEAR - "Fatal error: Call to undefined function: query()" when it exists!

[schlag]

I am receiving the error:
Fatal error: Call to undefined function: query()

..when attempting to call the query() function of PEAR DB.

I've checked and confirmed that:
The DB.php file DOES exist.
The query() function DOES exist in common.php (which I guess is somehow down the line included by DB.php or one of its includes).

I've tried including the DB.php file with both absolute and relative paths.

The strange thing is, this code worked a week ago. It worked fine in fact. It hasn't been touched since, however this error popped up out of nowhere.

What else could it be?

[ultraslacker]

Well, I assume you are using PEAR for establishing a database connection - add debugging and check the database connection code.