Localhost Upfront-dependencies 404 error on scripts and styles

Hi there,

I just copied my whole wordpress mu package to my localhost (MAMP) for development. Everything works just fine, except that i get 3 404 errors (files are missing) in upfront-dependencies.

domain.local/upfront-dependencies/styles/ff857f01a12ad35101896f0aae368ef8?ver=0.2 Failed to load resource: the server responded with a status of 404 (Not Found)
domain.local/upfront-dependencies/styles/ff857f01a12ad35101896f0aae368ef8?ver=0.2 Failed to load resource: the server responded with a status of 404 (Not Found)
domain.local/upfront-dependencies/scripts/19676ae3cff7cb048e0a128852057f69?ver=0.2 Failed to load resource: the server responded with a status of 404 (Not Found).

I tried the solution that was given in another topic, adding:

<Directory "/var/www/html">
   AllowOverride All
</Directory>

But that didn't work.

Then i tried to the following line to wp-config.php:
define('UPFRONT_DEBUG_LEVELS', 'dependencies');
and that did the trick.

But what is actually happening, when i add that line?