Static Content Deploy -> ERRORS

[ksz2013]

Hi,

When i try to deploy the static content
php -f bin/magento setup:static-content:deploy the following error is recieved:
Compilation from source:
frontend/Magento/luma/en_US/css/email-inline.less
variable @modal-slide-header__padding-vertical is undefined in file /m2/var/view_preprocessed/css/frontend/Magento/luma/en_US/css/source/_theme.less in _theme.less on line 254, column 37
252| // Modal popup
253| @modal-action-close__font-size: @font-size__base;
254| @modal-slide-action-close__padding: @modal-slide-header__padding-vertical @modal-popup__padding;
255|
256| // Checkout tooltip icon
257| @checkout-tooltip-icon__font-size: 21px;>

I am also having missing css files on the frontend, seems there are some errors in the less files

[daim2k5]

Related issue #2273, #2306

[dmitrii-fediuk]

My universal fix for all the «variable @modal-slide-header__padding-vertical is undefined» problems: https://mage2.pro/t/193