I am working a react project and when I tried to use a mixin like @include it gave a compiling error:

  ╷
7 │ ┌   @include mobile {
8 │ │     flex-direction: column;
9 │ └   }

Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
SassError: Undefined mixin.

I have installed the packages and checked to see if it wasnt installed properly I still get this error what can I do?

code:

@import "../../global.scss";

.contact {
  background-color: white;
  display: flex;

  @include mobile {
    flex-direction: column;
  }

  .left {
    flex: 1;
    overflow: hidden;

    img {
      height: 100%;
    }
  }