Symptoms
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The CLI PHP Composer extension command below fails with an error:
# plesk ext composer --application -list
Call to undefined function PleskExtComposerClicreate_function()
Cause
Plesk PHP Composer extension bug with ID #EXTPLESK-4427 which will be fixed in future extension updates.
Workaround
Until the bug is fixed as a workaround:
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Find the applications list at Domains > example.com > PHP Composer