i got an error.txt in the css folder while customizing plusstrap

[michapixel]

{"type":"Name","message":"variable @d is undefined","filename":"plusstrap.css","index":105133,"line":4391,"column":9,"extract":[".dropdown-menu .active > a:hover {"," color: @d ropdownLinkColorHover;"," text-decoration: none;"]}

[miramir]

me too, but i get text: {"type":"Name","message":"variable @popoverArrowOuterWid is undefined","filename":"plusstrap.css","index":99308,"line":4147,"column":20,"extract":[" &:after {"," border-width: @popoverArrowOuterWid th @popoverArrowOuterWidth 0;"," border-top-color: @popoverArrowOuterColor;"]}