Hello i had upgraded magento 2.2.2 to 2.3.0 and i am getting following error when i do setup:static-content:deploy
Compilation from source: /home/xxxxxxxx/public_html/xxxx/xxxxxx/vendor/magento/theme-frontend-blank/web/css/styles-m.less
variable @button-primary__font-family is undefined in file /home/xxxxx/public_html/xxxxx/xxxxx/var/view_preprocessed/pub/static/frontend/xxxxx/xxxxx/en_US/css/source/lib/_buttons.less in _buttons.less on line 279, column 27
277|
278| .lib-button-primary(
279| @_button-font-family: @button-primary__font-family,
280| @_button-font-size: @button-primary__font-size,
281| @_button-font-weight: @button-primary__font-weight,
282| @_button-line-height: @button-primary__line-height, in _extends.less
In File.php line 150:
The contents from the "/home/xxxxx/public_html/xxxxx/xxxxx/pub/static/frontend/xxxxx/xxxxx/en_US/css/styles-m.css" file can't be read. Warn
ing!file_get_contents(/home/xxxxx/public_html/alpha/xxxxx/pub/static/frontend/xxxxx/xxxxx/en_US/css/styles-m.css): failed to open stream: N
o such file or directory
Please help me