gulp-notify: [Error running notifier] Could not send message: error is not defined when try to import styles from other directory

[KonstantinShirmanov]

I have this gulp task for convert scss to css files.

import dartSass from "sass"
import gulpSass from "gulp-sass"
import groupCssMediaQueries from "gulp-group-css-media-queries"
import autoPrefixer from "gulp-autoprefixer"
import webpcss from "gulp-webpcss"
import GulpCleanCss from "gulp-clean-css"


const sass = gulpSass(dartSass);

export const scss = () => {
	return app.gulp.src(app.path.src.css, { sourcemaps: true })
	.pipe(app.plugins.plumber(
		app.plugins.notify.onError({
			title: "SCSS",
			message: "Error : <%= error.message %>" 
		})
	))	
	.pipe(app.plugins.cached("css"))
		.pipe(app.plugins.newer(app.path.build.css))
		.pipe(app.plugins.replace(/@img\//g, "../img/"))

		.pipe(sass({
			outputStyle: "expanded"
		}))

		.pipe(
			groupCssMediaQueries()
		)
		.pipe(
			autoPrefixer({
				overrideBrowserslist: ["last 5 version"],
				cascade: true,
				grid: true
			})
		)
		.pipe(app.plugins.remember("scss"))
		.pipe(webpcss({
			webpClass: ".webp",
			noWebpClass: ".no-webp"
		}))
		.pipe(app.gulp.dest(app.path.build.css))
		.pipe(GulpCleanCss())
		.pipe(
			app.plugins.rename({
				extname: ".min.css"
			})
		)
		.pipe(app.gulp.dest(app.path.build.css))
		.pipe(app.plugins.browsersync.stream())
}

app here is a global object for all tasks, were all pathes and common plugins are imported. I also heve a main.scss file and some other files, My scss task works fine when I import in main.scss the files, which are in the same directory as main.scss, like this:

@import "./fonts.scss";
But when I try to import in main.scss the file, which is in other directory like this:
@import "./base/mixins.scss";
Gulp throws an error in console:

gulp-notify: [Error running notifier] Could not send message: error is not defined

Also the weird is I have a plumber in my task, but the error throws only in console.

P.S. I could attach all my files including the gulpfile if you need it. And sorry for my poor English.