Upgrading from 2.0.4 to 2.06 Didn't Complete Using The System Upgrade.

[shevira]

Today when I tried to upgrade my magento from 2.0.4 to 2.0.6 I got this error. And sadly I can't rollback too.  Could someone help me please?

[2016-05-18 17:30:04 WIB] Job "maintenance_mode {"enable":true}" has been started
[2016-05-18 17:30:04 WIB] Magento maintenance mode is enabled.
[2016-05-18 17:30:04 WIB] Job "maintenance_mode {"enable":true}" has successfully completed
[2016-05-18 17:30:04 WIB] Job "update {"components":[{"name":"magento/product-community-edition","version":"2.0.6"}]}" has been started
[2016-05-18 17:30:04 WIB] Starting composer update...
[2016-05-18 17:30:05 WIB] ./composer.json has been updated

[2016-05-18 17:32:11 WIB] An error occurred while executing job "update {"components":[{"name":"magento/product-community-edition","version":"2.0.6"}]}": Could not complete update {"components":[{"name":"magento/product-community-edition","version":"2.0.6"}]} successfully: Command "update" failed: Loading composer repositories with package information
Updating dependencies (including require-dev)
- Removing magento/magento-composer-installer (0.1.6)
- Installing magento/magento-composer-installer (0.1.8)
Downloading: Connecting... Downloading: 0% Downloading: 10% Downloading: 35% Downloading: 45% Downloading: 70% Downloading: 95% Downloading: 100%

[ErrorException]
escapeshellarg() has been disabled for security reasons

update [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--lock] [--no-plugins] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [--with-dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [-i|--interactive] [--root-reqs] [packages1] ... [packagesN]

[ipragmatech]

Could you send message in the logs file? Current information is not sufficient to detect the issue. May be you should retry the migration from your backup ?

[Horaceslughorn]

Did you re-upgrade? What's happen? escapeshellarg() has been disabled for security reasons. Maybe some errors happen with your connector.

https://goo.gl/fcghyU

[Cosnett]

Hope someone can help!