Cannot update and install addon via CP

From within the Statamic Control Panel on my live website. I tried to run the 3.0.3 update and ran into the following error… Image of the error I tried making these changes: first I tried adding SetEnv COMPOSER_HOME '/usr/local/bin/composer' in .htaccess in the public but it didn't work and also tried this by adding COMPOSER_HOME=/usr/local/bin/composer to the .env file but i keep getting the error

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