Transformation failed: SCSS processing failed:

After I upgraded hugo to 0.58.3, after executing hugo server, it shows “ERROR 2019/09/22 15:39:44 Transformation failed: SCSS processing failed: file "stdin", line 11, col 1: File to import Not found or unreadable: spectre/src/variables”, I checked the scss, but I can’t find the problem. I didn’t have this problem in version 0.57. I want to know how to solve this problem.Below is the theme of scss
`$tag-leave: #32b643;
$tag-join:#ffb700;
$tag-note: #acb3c2;
$tag-daily: #2176ff;
$tag-fixed: #a1548b;
$tag-security: #e85600;
$tag-ZBrush: #2a2a2a;
// $primary-color: #e54747;

// Variables and mixins
@import “spectre/src/variables”;
@import “spectre/src/mixins”;

/*! Spectre.css v#{$version} | MIT License | github.com/picturepan2/spectre */
// Reset and dependencies
@import “spectre/src/normalize”;
@import “spectre/src/base”;

// Elements
@import “spectre/src/typography”;
// @import “spectre/src/asian”;
// @import “spectre/src/tables”;
// @import “spectre/src/buttons”;
// @import “spectre/src/forms”;
@import “spectre/src/labels”;
// @import “spectre/src/codes”;
// @import “spectre/src/media”;

// Icons
@import “spectre/src/icons/icons-core”;
@import “spectre/src/icons/icons-navigation”;

// Layout
@import “spectre/src/layout”;
// @import “spectre/src/navbar”;

// Components
@import “spectre/src/accordions”;
// @import “spectre/src/avatars”;
// @import “spectre/src/badges”;
// @import “spectre/src/breadcrumbs”;
// @import “spectre/src/bars”;
// @import “spectre/src/cards”;
// @import “spectre/src/chips”;
// @import “spectre/src/dropdowns”;
// @import “spectre/src/empty”;
// @import “spectre/src/menus”;
// @import “spectre/src/modals”;
// @import “spectre/src/navs”;
@import “spectre/src/pagination”;
// @import “spectre/src/panels”;
// @import “spectre/src/popovers”;
// @import “spectre/src/steps”;
// @import “spectre/src/tabs”;
// @import “spectre/src/tiles”;
// @import “spectre/src/toasts”;
// @import “spectre/src/tooltips”;

// Utility classes
// @import “spectre/src/animations”;
@import “spectre/src/utilities”;

@import “spectre/src/timelines”;

.tag-leave {
background: $tag-leave;
}
.tag-join {
background: $tag-join;
}

.tag-note {
background: $tag-note;
}

.tag-daily {
background: $tag-daily;
}

.tag-fixed {
background: $tag-fixed;
}

.tag-security {
background: $tag-security;
}

.tag-ZBrush {
background: $tag-Zbrush;
}

.changes li {
list-style: none;
}

.changes h4 {
margin-bottom: 0;
}

.full-screen-message {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
text-align: center;
min-height: 100vh;
font-size: 200%;
text-decoration: none;
color: #363636;
}
.full-screen-message a {
display: inline-block;
}

.deprecated {
border-radius: 10px;

label {
    cursor: pointer;
}

.accordion-body {
    margin-top: 1rem;

    .timeline-item::before {
        background-color: #ffb700;
    }

    p {
        margin: 0 0 .2rem;
    }
}

}

.experimental ul {
margin: 0.4em;
}

li code {
padding: 0.2em 0.4em;
margin: 0;
font-size: 85%;
background-color: rgba(27,31,35,0.05);
border-radius: 3px;
vertical-align: middle;
}
`

I’m guessing here, but this is probably related to this{

I assume I have stepped wrong here somewhere, but I have not been able to reproduce it. There is, however, a workaround described in that thread – I wouldn’t call it a workaround, either, as it is a cleaner solution.