GUlp - following tasks did not complete - gulp

Question

I'm using gulp 4, and i have the following gulpfile.js:
'use strict';
var gulp = require('gulp'), del = require('del');
gulp.task('copy-fonts', () => {
return gulp.src(['node_modules/ng/resources/fonts/**/*'])
.pipe(gulp.dest('apps/src/assets/fonts'));
});
gulp.task('clean-copy', () => {
del(['apps/src/assets/fonts']);
});
gulp.task('copy-assets', gulp.series(['clean-copy', 'copy-fonts']), (done) => {
console.log("Gulp is running...");
done();
});
When i run this command: gulp copy-assets, i get the below error:
[11:59:06] The following tasks did not complete: copy-assets
[11:59:06] Did you forget to signal async completion?

Answer 1

In this code:
gulp.task('copy-assets', gulp.series(['clean-copy', 'copy-fonts']), (done) => {
console.log("Gulp is running...");
done();
});
the task has three arguments - that is gulp v3 syntax, not gulp 4. So change that to
gulp.task('copy-assets', gulp.series(['clean-copy', 'copy-fonts'], (done) => {
console.log("Gulp is running...");
done();
));
The done return is now within the gulp.series arguments. Also make this change, I think it will be necessary:
gulp.task('clean-copy', (cb) => {
del(['apps/src/assets/fonts'] );
cb();
});