[Mediawiki-l] After config, "Failed opening '/tmp/tpl_0_7_0_7... .php' for inclusion".

[Erik Hermansen]

I copied MediaWiki 1.3.8 files over to my web-accessible dir.  I created a 
MySQL database and user.  I ran the Config\index.php page and it reported 
back with no errors.  I looked at the new database and it is populated with 
tables from the config script.  Everything looked good at that point.  Then 
I browsed to the top-level page of the wiki, and got this error:

Warning: Failed opening 
'/tmp/tpl_0_7_0_7d90f7cef16f0e547fab72ff18d4b4a1.php' for inclusion 
(include_path='.:/home/httpd/vhosts/mydomain.com/httpdocs/mediawiki:/home/httpd/vhosts/mydomain.com/httpdocs/mediawiki/includes:/home/httpd/vhosts/mydomain.com/httpdocs/mediawiki/languages') 
in 
/home/httpd/vhosts/mydomain.com/httpdocs/mediawiki/PHPTAL-NP-0.7.0/libs/PHPTAL/Template.php 
on line 430
[pear_error: message="Template function 
'tpl_0_7_0_7d90f7cef16f0e547fab72ff18d4b4a1' not found (template source : 
/home/httpd/vhosts/mydomain.com/httpdocs/mediawiki/templates/xhtml_slim.pt" 
code=0 mode=return level=notice prefix="" info=""]

The file that it complains about is in fact present at 
"/tmp/tpl_0_7_0_7d90f7cef16f0e547fab72ff18d4b4a1.php".  And I'm not sure 
how MediaWiki works, but this file must have been created by running the 
PHPs since I didn't put it there.  This leads me to believe that the PHP 
should have permissions to read from that file.  So what's wrong here?

I apologize if I am asking something that has come up before.  I tried to 
find an existing answer to this, since I am not doing anything very unusual 
and it seems like it must be something that lots of people would run 
into.  But unfortunately I couldn't find anything on it.

-Erik