Magento 2.3.1 Composer Fatal error when installing Ext

[airsoftsupplydrop]

Trying to install anything on Magento 2.3.0 & 2.3.1 using Composer I get the following error.

Does anyone know how to fix this?

Fatal error: Uncaught TypeError: Return value of Magento\InventoryComposerInstaller\Plugin_composer_tmp1::initModuleDeployment() must be an instance of Magento\InventoryComposerInstaller\void, none returned in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code:69 Stack trace:

0 [internal function]: Magento\InventoryComposerInstaller\Plugin_composer_tmp1->initModuleDeployment(Object(Composer\Script\Event))
1 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(176): call_user_func(Array, Object(Composer\Script\Event))
2 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(96): Composer\EventDispatcher\EventDispatcher->doDispatch(Object(Composer\Script\Event))
3 phar:///opt/cpanel/composer/bin/composer/src/Composer/Installer.php(204): Composer\EventDispatcher\EventDispatcher->dispatchScript('pre-update-cmd', true)
4 phar:///opt/cpanel/composer/bin/composer/src/Composer/Command/RequireCommand.php(18 in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code on line 69

[PankajS_Magento]

Hi @airsoftsupplydrop 

This error can be related to the PHP version compatibility. You need to chack that you are using compatible version with Magento 2.3.X.

Here is the list of Magento required php versions:

1. For Magento 2.3 : PHP 7.1
2. For Magento 2.2 : PHP 7.1 or PHP 7.0
3. For Magento 2.1 : PHP 7.1, PHP 7.0 or PHP 5.6
4. For Magento 2.0 : PHP 7.0, PHP 5.6 or PHP 5.5

You need to check your PHP version, and upgrade or downgrade PHP if needed.

You will never make Magento 2 works fine without the good version of PHP.

Thanks

--
If my answer is useful, please Accept as Solution & give Kudos

[airsoftsupplydrop]

im running PHP 7.2.18 (cli) (built: May 19 2019 18:16:07) ( NTS )

[spareparts]

hello. i have installed a Magento 2.3.4 version and trying to install the data migration tool version 2.3.4. After launching the commands:

composer config repositories.magento composer https://repo.magento.com

composer require magento/data-migration-tool:2.3.4

i have the same output:

Fatal error: Uncaught TypeError: Return value of Magento\InventoryComposerInstaller\Plugin_composer_tmp1::initModuleDeployment() must be an instance of Magento\InventoryComposerInstaller\void, none returned in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code:69

Stack trace:

#0 [internal function]: Magento\InventoryComposerInstaller\Plugin_composer_tmp1->initModuleDeployment(Object(Composer\Script\Event))

#1 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(176): call_user_func(Array, Object(Composer\Script\Event))

#2 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(96): Composer\EventDispatcher\EventDispatcher->doDispatch(Object(Composer\Script\Event))

#3 phar:///opt/cpanel/composer/bin/composer/src/Composer/Installer.php(205): Composer\EventDispatcher\EventDispatcher->dispatchScript('pre-update-cmd', true)

#4 phar:///opt/cpanel/composer/bin/composer/src/Composer/Command/RequireCommand.php(20 in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code on line 69

I have tried to change from PHP 7.3 to 7.2 but no results. Anybody has solved this issue? regards

[hhelmey]

i have the same problem as mention by the user spareparts, i dont know if anyone has found a solution.

---

@spareparts wrote:

hello. i have installed a Magento 2.3.4 version and trying to install the data migration tool version 2.3.4. After launching the commands:

composer config repositories.magento composer https://repo.magento.com

composer require magento/data-migration-tool:2.3.4

i have the same output:

Fatal error: Uncaught TypeError: Return value of Magento\InventoryComposerInstaller\Plugin_composer_tmp1::initModuleDeployment() must be an instance of Magento\InventoryComposerInstaller\void, none returned in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code:69

Stack trace:

#0 [internal function]: Magento\InventoryComposerInstaller\Plugin_composer_tmp1->initModuleDeployment(Object(Composer\Script\Event))

#1 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(176): call_user_func(Array, Object(Composer\Script\Event))

#2 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(96): Composer\EventDispatcher\EventDispatcher->doDispatch(Object(Composer\Script\Event))

#3 phar:///opt/cpanel/composer/bin/composer/src/Composer/Installer.php(205): Composer\EventDispatcher\EventDispatcher->dispatchScript('pre-update-cmd', true)

#4 phar:///opt/cpanel/composer/bin/composer/src/Composer/Command/RequireCommand.php(20 in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code on line 69

I have tried to change from PHP 7.3 to 7.2 but no results. Anybody has solved this issue? regards

---

---

@spareparts wrote:

hello. i have installed a Magento 2.3.4 version and trying to install the data migration tool version 2.3.4. After launching the commands:

composer config repositories.magento composer https://repo.magento.com

composer require magento/data-migration-tool:2.3.4

i have the same output:

Fatal error: Uncaught TypeError: Return value of Magento\InventoryComposerInstaller\Plugin_composer_tmp1::initModuleDeployment() must be an instance of Magento\InventoryComposerInstaller\void, none returned in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code:69

Stack trace:

#0 [internal function]: Magento\InventoryComposerInstaller\Plugin_composer_tmp1->initModuleDeployment(Object(Composer\Script\Event))

#1 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(176): call_user_func(Array, Object(Composer\Script\Event))

#2 phar:///opt/cpanel/composer/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(96): Composer\EventDispatcher\EventDispatcher->doDispatch(Object(Composer\Script\Event))

#3 phar:///opt/cpanel/composer/bin/composer/src/Composer/Installer.php(205): Composer\EventDispatcher\EventDispatcher->dispatchScript('pre-update-cmd', true)

#4 phar:///opt/cpanel/composer/bin/composer/src/Composer/Command/RequireCommand.php(20 in phar:///opt/cpanel/composer/bin/composer/src/Composer/Plugin/PluginManager.php(195) : eval()'d code on line 69

I have tried to change from PHP 7.3 to 7.2 but no results. Anybody has solved this issue? regards

---

[Hiren_K_Patel]

Hello @airsoftsupplydrop ,

Please try to add composer.phar in root of magento project and then try with following command instead of using composer require or composer update 

php -dmemory_limit=6G composer.phar require

php -dmemory_limit=6G composer.phar update

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[hhelmey]

Hello ,  i am not able to  understand, would you please little eleborate it please.