Installation bug

[askwhyweb]

Found Bug during installation (possibly Zend Framework bug). Console log from installation setup is as below.

Starting Magento installation:
File permissions check...
Enabling Maintenance Mode...

Installing deployment configuration...
[ERROR] exception 'InvalidArgumentException' with message 'Invalid backend frontname ' in F:\xampp\htdocs\magento2\lib\internal\Magento\Framework\App\DeploymentConfig\BackendConfig.php:32

Stack trace:
#0 F:\xampp\htdocs\magento2\setup\module\Magento\Setup\src\Model\Installer.php(343): Magento\Framework\App\DeploymentConfig\BackendConfig->__construct(Array)
#1 F:\xampp\htdocs\magento2\setup\module\Magento\Setup\src\Model\Installer.php(532): Magento\Setup\Model\Installer->createBackendConfig(Array)
#2 [internal function]: Magento\Setup\Model\Installer->installDeploymentConfig(Array)
#3 F:\xampp\htdocs\magento2\setup\module\Magento\Setup\src\Model\Installer.php(296): call_user_func_array(Array, Array)
#4 F:\xampp\htdocs\magento2\setup\module\Magento\Setup\src\Controller\Install.php(79): Magento\Setup\Model\Installer->install(Array)
#5 F:\xampp\htdocs\magento2\vendor\zendframework\zend-mvc\Zend\Mvc\Controller\AbstractActionController.php(83): Magento\Setup\Controller\Install->startAction()
#6 [internal function]: Zend\Mvc\Controller\AbstractActionController->onDispatch(Object(Zend\Mvc\MvcEvent))
#7 F:\xampp\htdocs\magento2\vendor\zendframework\zend-eventmanager\Zend\EventManager\EventManager.php(468): call_user_func(Array, Object(Zend\Mvc\MvcEvent))
#8 F:\xampp\htdocs\magento2\vendor\zendframework\zend-eventmanager\Zend\EventManager\EventManager.php(207): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#9 F:\xampp\htdocs\magento2\vendor\zendframework\zend-mvc\Zend\Mvc\Controller\AbstractController.php(117): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#10 F:\xampp\htdocs\magento2\vendor\zendframework\zend-mvc\Zend\Mvc\DispatchListener.php(114): Zend\Mvc\Controller\AbstractController->dispatch(Object(Zend\Http\PhpEnvironment\Request), Object(Zend\Http\PhpEnvironment\Response))
#11 [internal function]: Zend\Mvc\DispatchListener->onDispatch(Object(Zend\Mvc\MvcEvent))
#12 F:\xampp\htdocs\magento2\vendor\zendframework\zend-eventmanager\Zend\EventManager\EventManager.php(468): call_user_func(Array, Object(Zend\Mvc\MvcEvent))
#13 F:\xampp\htdocs\magento2\vendor\zendframework\zend-eventmanager\Zend\EventManager\EventManager.php(207): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#14 F:\xampp\htdocs\magento2\vendor\zendframework\zend-mvc\Zend\Mvc\Application.php(313): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#15 F:\xampp\htdocs\magento2\setup\index.php(24): Zend\Mvc\Application->run()
#16 {main}

Composer log is as below (probably requires for full troubleshoot).

F:\xampp\htdocs\magento2>php composer.phar install
Loading composer repositories with package information
Installing dependencies (including require-dev)

• Installing zendframework/zend-stdlib (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-validator (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-escaper (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-uri (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-eventmanager (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-code (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-server (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-soap (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-console (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-modulemanager (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-servicemanager (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-mvc (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-text (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-loader (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-view (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-config (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-filter (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-inputfilter (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-form (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-di (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-math (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-json (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-serializer (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-log (2.3.1)
  Downloading: 100%
• Installing zendframework/zend-http (2.3.1)
  Downloading: 100%
• Installing magento/zendframework1 (1.12.9-patch1)
  Downloading: 100%
• Installing symfony/process (v2.6.1)
  Downloading: 100%
• Installing symfony/finder (v2.6.1)
  Downloading: 100%
• Installing symfony/console (v2.6.1)
  Downloading: 100%
• Installing seld/jsonlint (1.3.0)
  Downloading: 100%
• Installing justinrainbow/json-schema (1.1.0)
  Downloading: 100%
• Installing composer/composer (1.0.0-alpha8)
  Downloading: 100%
• Installing sebastian/version (1.0.3)
  Downloading: 100%
• Installing sebastian/exporter (1.0.2)
  Downloading: 100%
• Installing sebastian/environment (1.2.1)
  Downloading: 100%
• Installing sebastian/diff (1.2.0)
  Downloading: 100%
• Installing sebastian/comparator (1.1.0)
  Downloading: 100%
• Installing doctrine/instantiator (1.0.4)
  Downloading: 100%
• Installing phpunit/php-text-template (1.2.0)
  Downloading: 100%
• Installing phpunit/phpunit-mock-objects (2.3.0)
  Downloading: 100%
• Installing phpunit/php-timer (1.0.5)
  Downloading: 100%
• Installing phpunit/php-file-iterator (1.3.4)
  Downloading: 100%
• Installing phpunit/php-token-stream (1.3.0)
  Downloading: 100%
• Installing phpunit/php-code-coverage (2.0.13)
  Downloading: 100%
• Installing phpunit/phpunit (4.1.0)
  Downloading: 100%
• Installing squizlabs/php_codesniffer (1.5.3)
  Downloading: 100%
• Installing symfony/filesystem (v2.5.8)
  Downloading: 100%
• Installing symfony/config (v2.5.8)
  Downloading: 100%
• Installing symfony/dependency-injection (v2.5.8)
  Downloading: 100%
• Installing pdepend/pdepend (2.0.4)
  Downloading: 100%
• Installing phpmd/phpmd (2.1.3)
  Downloading: 100%
• Installing league/climate (2.5.0)
  Downloading: 100%
• Installing sjparkinson/static-review (4.1.1)
  Downloading: 100%
• Installing symfony/stopwatch (v2.6.1)
  Downloading: 100%
• Installing symfony/event-dispatcher (v2.6.1)
  Downloading: 100%
• Installing fabpot/php-cs-fixer (v1.3)
  Downloading: 100%

zendframework/zend-validator suggests installing zendframework/zend-db (Zend\Db
component)
zendframework/zend-validator suggests installing zendframework/zend-i18n (Zend\I
18n component to allow translation of validation error messages as well as to us
e the various Date validators)
zendframework/zend-validator suggests installing zendframework/zend-resources (T
ranslations of validator messages)
zendframework/zend-validator suggests installing zendframework/zend-session (Zen
d\Session component)
zendframework/zend-code suggests installing doctrine/common (Doctrine\Common >=2
.1 for annotation features)
zendframework/zend-mvc suggests installing zendframework/zend-authentication (Ze
nd\Authentication component for Identity plugin)
zendframework/zend-mvc suggests installing zendframework/zend-i18n (Zend\I18n co
mponent for translatable segments)
zendframework/zend-mvc suggests installing zendframework/zend-session (Zend\Sess
ion component for FlashMessenger, PRG, and FPRG plugins)
zendframework/zend-mvc suggests installing zendframework/zend-version (Zend\Vers
ion component)
zendframework/zend-view suggests installing zendframework/zend-authentication (Z
end\Authentication component)
zendframework/zend-view suggests installing zendframework/zend-feed (Zend\Feed c
omponent)
zendframework/zend-view suggests installing zendframework/zend-i18n (Zend\I18n c
omponent)
zendframework/zend-view suggests installing zendframework/zend-navigation (Zend
Navigation component)
zendframework/zend-view suggests installing zendframework/zend-paginator (Zend\P
aginator component)
zendframework/zend-view suggests installing zendframework/zend-permissions-acl (
Zend\Permissions\Acl component)
zendframework/zend-config suggests installing zendframework/zend-i18n (Zend\I18n
component)
zendframework/zend-filter suggests installing zendframework/zend-crypt (Zend\Cry
pt component)
zendframework/zend-filter suggests installing zendframework/zend-i18n (Zend\I18n
component)
zendframework/zend-form suggests installing zendframework/zend-captcha (Zend\Cap
tcha component)
zendframework/zend-form suggests installing zendframework/zend-i18n (Zend\I18n c
omponent)
zendframework/zend-form suggests installing zendframework/zendservice-recaptcha
(ZendService\ReCaptcha component)
zendframework/zend-math suggests installing ext-gmp (If using the gmp functional
ity)
zendframework/zend-math suggests installing ircmaxell/random-lib (Fallback rando
m byte generator for Zend\Math\Rand if OpenSSL/Mcrypt extensions are unavailable
)
zendframework/zend-log suggests installing ext-mongo (*)
zendframework/zend-log suggests installing zendframework/zend-db (Zend\Db compon
ent)
zendframework/zend-log suggests installing zendframework/zend-mail (Zend\Mail co
mponent)
symfony/console suggests installing psr/log (For using the console logger)
phpunit/php-code-coverage suggests installing ext-xdebug (>=2.2.1)
phpunit/phpunit suggests installing phpunit/php-invoker (~1.1)
symfony/dependency-injection suggests installing symfony/proxy-manager-bridge (G
enerate service proxies to lazy load them)
sjparkinson/static-review suggests installing sensiolabs/security-checker (Requi
red for ComposerSecurityReview.)
symfony/event-dispatcher suggests installing symfony/http-kernel ()
Writing lock file
Generating autoload files

[Sanuch]

Can you show console command which you try to install?

[askwhyweb]

Sure.

Here you go.

[Sanuch]

What you set in field 'Magento Admin Address'?

[buskamuza]

@askwhyweb , did you go through each installation step straight or sometimes went back? Or maybe refreshed some pages?

[askwhyweb]

I had followed all of the steps and all of them step by step.

1 more issue is with password validation, but will compose detail later.

For now this is a little critical issue which means we can not test :)

[askwhyweb]

@Sanuch the address was http://localhost/magento2/admin while admin was in an input box.

[vigentocommerce]

Have you try with address 127.0.0.1 and disable mod_rewrite ?

[askwhyweb]

@vigentocommerce with the said changes i.e. using address 127.0.0.1 and without mod_rewrite it works like a charm and successfully installed without any issue.

I believe a checkbox like skip base url validation (likewise happening in Magento 1.xx) might be helpful.

Thanks

[matrixbegins]

I also had same issues. The case with me was on this step I refreshed the page and right after that it started to report the error. So I did a clean install again and this time I changed /admin to /myadmin Then I never encountered this error.

[georgebabarus]

I had same problem.
I was trying to install magento 2 on nginx server.
After I disabled mod_rewrite, everything worked fine.

[snky1987]

@matrixbegins I had the same error when I tried to test instalation (after successfull install) because I had an file permission error when installer tried to delete installation.log.

When I moved back to admin I notified that my admin details disappeared (after page refresh). When I typed them in error disappeared so one of possible solutions may be to reset all steps on page refresh and let the users get through each step again to make sure that everything is filled in. Or add additional validation when someone click Install Now.

[matrixbegins]

@snky1987 I agree.