html-minifier error "ERROR: The specified config file doesn’t exist or is unreadable"

Using the npm package "html-minifier" (v1.0.0) I am trying to run this command (from Linux Mint, on the command line):
html-minifier -c html-minifier.cfg -o lib/welcome.html client/welcome.html

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However it fails with the error:
ERROR: The specified config file doesn’t exist or is unreadable:

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The config file /var/www/projectfolder/html-minifier.cfg does exist and is readable.

Can anyone suggest why that might be happening?
LVL 36
Terry WoodsIT GuruAsked:
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Terry WoodsIT GuruAuthor Commented:
I installed v0.8.0:
sudo npm install -g html-minifier@0.8.0

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and then the command given above worked. Looks like it's a bug specific to version 1.0.0

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