Extra.less doesn't work

[Ferry]

Hi,

We tried to change some elements on the site, but unfortunately extra.less doesn't work with any style including the default one.

After making any css, errors like src/XF/CssRenderException start to occur

Example of the css we want to put in

.message-attachments {
border-radius 6px;
}
Click to expand...

Stack trace​

3662 | // setup.less customizations should be avoided when possible.
3663 |
3664 | .message-attachments {
3665| border-radius 6px...
Click to expand...

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Extra.less doesn't work

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