Magento 2.2.1 error during static content deploy

Question

I have a own template in app/design/frontend/tm/XXX-theme. I built it like described in the dev docs. Parent theme is luma. Magento run in developer Mode. After i use setup:static-content:deploy de_DE en_GB. SSH shows:

Compilation from source:
frontend/tm/XXX-theme/de_DE/css/styles-m.less
Warning: Invalid argument supplied for foreach() in /www/htdocs/XXX/XXX/XXX/vendor/oyejorge/less.php/lib/Less/Tree/Value.php on line 26

In Browser Template CSS is not loading:

The resource from “https://www.example.com/pub/static/frontend/tm/XXX-theme/de_DE/css/styles-m.css” was blocked due to MIME type (“text/plain”) mismatch (X-Content-Type-Options: nosniff)

Have anyone a Idea? I read since yet many articel for this Problem and tried. But I have no clue.

Answer 1

This is normally the result of a compilation error in the css.

Its failing and something is not generating. Have you tried running static content deploy with show errors. Failing that dump php output to file. This can be a pain to debug.

php -d display_errors=1 bin/magento setup:static-content:deploy

php -d bin/magento setup:static-content:deploy > output.log

Update

Your memory limit is low. Try to see if you can put this up to at least 512MB.

Try this instead

php -d display_errors=1 -d memory_limit=-1 bin/magento setup:static-content:deploy

Answer 2

I tried many things. After I delete the CSS File complete from my custom theme it works after setup:static-content:deploy. I think there was a problem with any less or css in my custom theme. So it throw an error within the compiling progress. Now the fallback works and the data come from the parent theme.