Error: Invalid language tag - C.UTF-8 is not recognized

Hello, I am facing an issue while attempting to utilize UNCSS to eliminate unused CSS styles for the first time. The error message that pops up is as follows:

A Fontconfig warning has been triggered: ignoring C.UTF-8 due to it not being a valid language tag

The error occurs at /home/ubuntu/.nvm/v0.10.35/lib/node_modules/uncss/node_modules/bluebird/js/main/async.js:43 fn = function () { throw arg; }; ^ Error: Fontconfig warning: ignoring C.UTF-8: not a valid language tag

at Socket.onStderr (/home/ubuntu/.nvm/v0.10.35/lib/node_modules/uncss/node_modules/phridge/lib/spawn.js:79:28)
at Socket.emit (events.js:117:20)
at Socket.<anonymous> (_stream_readable.js:765:14)
at Socket.emit (events.js:92:17)
at emitReadable_ (_stream_readable.js:427:10)
at emitReadable (_stream_readable.js:423:5)
at readableAddChunk (_stream_readable.js:166:9)
at Socket.Readable.push (_stream_readable.js:128:10)
at Pipe.onread (net.js:529:21)

Despite trying Gulp and conducting extensive research in hopes of finding a solution, I am still unable to comprehend the output and its necessary fix.

Any guidance or assistance in resolving this matter would be immensely appreciated.

- j

Answer №1

The issue at hand is a result of a flaw in fontconfig. This problem was reported as resolved in 2013, so receiving assistance from this end might be unlikely.

However, you have the option to switch to a different locale instead of C.UTF-8:

$ sudo locale-gen en_US en_US.UTF-8
$ sudo dpkg-reconfigure locales
$ sudo update-locale LANG=en_US

You can verify if the changes took effect by using the following command:

$ locale

LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8

If you haven't already, make sure to run:

$ npm install -g uncss

Now, everything should be functioning correctly:

$ uncss http://yoururl.com > style.css

Answer №2

Setting LC_ALL=en_US.utf8 fixed the issue for me.

I encountered the same problem, but entering this one command resolved it completely.

After checking my available locales with locale -a, I discovered en_US.utf8 listed there. More information on locales can be found at:

(Please note that this change is only temporary and not permanent)

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