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composer/doc/articles/troubleshooting.md

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<!--
tagline: Solving problems
-->
# Troubleshooting
This is a list of common pitfalls on using Composer, and how to avoid them.
## General
1. When facing any kind of problems using Composer, be sure to **work with the
latest version**. See [self-update](../03-cli.md#self-update) for details.
2. Ensure you're **installing vendors straight from your `composer.json`** via
`rm -rf vendor && composer update -v` when troubleshooting, excluding any
possible interferences with existing vendor installations or `composer.lock`
entries.
## Package not found
1. Double-check you **don't have typos** in your `composer.json` or repository
branches and tag names.
2. Be sure to **set the right
[minimum-stability](../04-schema.md#minimum-stability)**. To get started or be
sure this is no issue, set `minimum-stability` to "dev".
3. Packages **not coming from [Packagist](http://packagist.org/)** should
always be **defined in the root package** (the package depending on all
vendors).
4. Use the **same vendor and package name** throughout all branches and tags of
your repository, especially when maintaining a third party fork and using
`replace`.
## Memory limit errors
If composer shows memory errors on some commands:
PHP Fatal error: Allowed memory size of XXXXXX bytes exhausted <...>
The `memory_limit` ini value should be increased.
> **Note:** Composer internally increases the memory_limit to 512M.
> It is a good idea to create an issue for composer if you get memory errors.
Get current value:
php -r "echo ini_get('memory_limit').PHP_EOL;"
Increase limit with `php.ini` for a `CLI SAPI` (ex. `/etc/php5/cli/php.ini` for
Debian-like systems):
; Use -1 for unlimited or define explicit value like 512M
memory_limit = -1
Or with command line arguments:
php -d memory_limit=-1 composer.phar <...>