Shell/Bash: php fatal error: class updatehelper\composerplugin contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods (composer\plugin\plugininterface::deactivate Example

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PHP Fatal error: Class UpdateHelper\ComposerPlugin contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods (Composer\Plugin\PluginInterface::deactivate

composer update kylekatarnls/update-helper
#if doesnot work use following:
composer update --prefer-source


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