Error: cannot find bootstrap.php

I keep getting this error in my error logs on production server:

Fatal Error (256): Can't find application bootstrap file. Please
create /home/app/public_html/app/config/bootstrap.php, and make sure
it is readable by PHP. in [CORE/cake/libs/configure.php, line 631]

The file is definitely there, and readable. It's working fine on my
local machine. Weird thing is, the application appears to be working
fine on the production server as well, but it's just scaring me I'm
getting hundreds of these warnings every day in /tmp/logs/error.log.

Anyone else have the same problem?
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