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# Server Errors
| **Code** | **Most likely cause** |
|:---------|:----------------------|
| 400 | Controller failed to return valid set of sources to serve |
| 500 | Minifier threw exception (e.g. JSMin choked on syntax) |
You can find details by enabling FirePHP logging:
1. Install/enable FirePHP for [Firefox](https://addons.mozilla.org/en-US/firefox/addon/6149) or [Chrome](https://chrome.google.com/webstore/detail/firephp4chrome/gpgbmonepdpnacijbbdijfbecmgoojma?hl=en-US).
1. Open the Chrome DevTools/Firebug console
1. Set `$min_errorLogger = true;` in config.php
1. Reload the Minify URL
Hopefully you'll see the error appear:
```
Minify: Something bad happened!
```
# Javascript/CSS Problems
When Javascript errors occur, or URIs in CSS files are incorrectly rewritten, enable "debug mode" to ease debugging combined files:
1. Set `$min_allowDebugFlag = true;` in config.php
1. Append `&debug` to the Minify URI. E.g. `/min/?f=script1.js,script2.js&debug` (or use the bookmarklet provided by /min/builder/)
In "debug mode":
* comments are inserted into the output showing you line numbers in the original file(s)
* no minification is performed
* In CSS, URI rewriting _is_ performed
* In CSS, a leading comment shows how URIs were rewritten.
Example: a combination of two Javascript files in debug mode
```js
/* firstFile.js */
/* 1 */ (function () {
/* 2 */ if (window.foo) {
...
/* 11 */ })();
;
/* secondFile.js */
/* 1 */ var Foo = window.Foo || {};
/* 2 */
...
```
Example: Top of CSS output in debug mode
```
docRoot : M:\home\foo\www
currentDir : M:\home\foo\www\css
file-relative URI : typography.css
path prepended : M:\home\foo\www\css\typography.css
docroot stripped : \css\typography.css
traversals removed : /css/typography.css
file-relative URI : ../images/bg.jpg
path prepended : M:\home\foo\www\css\..\images\bg.jpg
docroot stripped : \css\..\images\bg.jpg
traversals removed : /images/bg.jpg
```
### Tips for handling Javascript errors
* Use the latest version (2.1.4 beta as of Dec 2010)
* Try [debug mode](#javascriptcss-problems) to make the combined file more readable (and error locations findable)
* Find out if other browsers have the same error
* For pre-minified files, make the filenames end in `.min.js` or `-min.js`, which will prevent Minify from altering them
* Test your scripts in [JSLint](http://www.jslint.com/).
## See Also
* [CommonProblems](CommonProblems.wiki.md)
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