css minifi not working

[TuniDev-HUB]

Please, can you help me to find where is my mistake (Thank's) here is my code : var minCssSetting = new CssSettings() { CommentMode = CssComment.Important, MinifyExpressions = true, OutputMode = OutputMode.SingleLine, TermSemicolons = false, };

pipeline.AddCssBundle("site-Ar.min.css",

"_Css/StyleImport-Ar.css",
"Assets/css/tiny-slider.css",
"Assets/css/nouislider.css",
"Assets/css/theme.css",
"Assets/css/cartzilla-icon.css",
"_Css/StyleCartzilla.css",
"_Css/StyleCartzilla-Menu.css",
"_Css/StyleCartzilla-Divers.css",
"_Css/StyleCartzilla-Product.css",
"_Css/StyleNotification.css",
"_Css/StyleReview.css",
"_Css/StyleDivider.css",
"_Css/StylePage.css",
"_Css/croppie.min.css",
"_Css/StyleFont-Ar.css"

).MinifyCss(minCssSetting);