the task can't be called by watch module. - gulp

Question

It's very weird. The 'htmltemplates' task is working, but the 'html-templates' task is not working. I tried many things.
When I executed the gulp command, it worked. but the task wan't called by watch module.
Why? Help me...
var gulp = require('gulp'),
// usemin = require('gulp-usemin'),
wrap = require('gulp-wrap'),
connect = require('gulp-connect'),
watch = require('gulp-watch'),
// minifyCss = require('gulp-minify-css'),
minifyJs = require('gulp-uglify'),
concat = require('gulp-concat'),
less = require('gulp-less'),
rename = require('gulp-rename'),
html2js = require('gulp-html2js');
// minifyHTML = require('gulp-minify-html');
var paths = {
theme_scripts: '../admin/assets/theme-js/**/*.*',
scripts: '../admin/assets/js/**/*.*',
styles: '../admin/assets/css/**/*.*',
images: '../admin/assets/img/**/*.*',
htmltemplates: '../admin/assets/templates/**/*.html',
html_templates: '../admin/app/**/*.html',
app_js: '../admin/app/**/*.js',
index: '../admin/index.html',
less: '../admin/assets/less/*.less',
bower_fonts: 'src/components/**/*.{ttf,eot,woff,eof,svg}'
};
/**
* Handle bower components from index
*/
gulp.task('usemin', function() {
return gulp.src(paths.index)
// .pipe(usemin({
// js: [minifyJs(), 'concat'],
// css: [minifyCss({keepSpecialComments: 0}), 'concat'],
// }))
.pipe(gulp.dest('../src/main/webapp/'));
});
/**
* Copy assets
*/
gulp.task('build-assets', ['copy-bower_fonts']);
gulp.task('copy-bower_fonts', function() {
return gulp.src(paths.bower_fonts)
.pipe(rename({
dirname: '/fonts'
}))
.pipe(gulp.dest('../src/main/webapp'));
});
/**
* Handle custom files
*/
gulp.task('build-custom', ['html-template','copy-components', 'custom-images', 'app-js','custom-js', 'theme-js', 'lib-less' ,'custom-less', 'custom-templates']);
gulp.task('copy-components', function() {
return gulp.src('../admin/assets/components/**/*.*')
.pipe(gulp.dest('../src/main/webapp/components'));
});
gulp.task('custom-images', function() {
return gulp.src(paths.images)
.pipe(gulp.dest('../src/main/webapp/img'));
});
gulp.task('app-js', function() {
return gulp.src(paths.app_js)
//.pipe(minifyJs())
.pipe(concat('st-openpms.concat.js'))
.pipe(gulp.dest('../src/main/webapp/js'));
});
gulp.task('theme-js', function() {
return gulp.src(paths.theme_scripts)
//.pipe(minifyJs())
.pipe(concat('dashboard.min.js'))
.pipe(gulp.dest('../src/main/webapp/js'));
});
gulp.task('custom-js', function() {
return gulp.src(paths.scripts)
// .pipe(minifyJs())
// .pipe(concat('openpms.concat.js'))
.pipe(gulp.dest('../src/main/webapp/js'));
});
gulp.task('custom-less', function() {
return gulp.src(paths.less)
.pipe(less())
.pipe(gulp.dest('../src/main/webapp/css'));
});
gulp.task('lib-less', function() {
return gulp.src(paths.less)
.pipe(less())
.pipe(gulp.dest('../src/main/webapp/css'));
});
gulp.task('custom-templates', function() {
return gulp.src(paths.htmltemplates)
// .pipe(minifyHTML())
.pipe(gulp.dest('../src/main/webapp/templates'));
});
gulp.task('html-template', function(url) {
gulp.src(paths.html_templates)
.pipe(html2js(
{
base : '../admin/app/',
outputModuleName: 'RedCA',
useStrict: true
}
))
.pipe(concat('openpms-st-test.templates.js'))
.pipe(gulp.dest('../src/main/webapp'))
})
/**
* Watch custom files
*/
gulp.task('watch', function() {
gulp.watch([paths.html_templates], ['html-template']);
gulp.watch([paths.images], ['custom-images']);
gulp.watch([paths.styles], ['custom-less']);
gulp.watch([paths.scripts], ['custom-js']);
gulp.watch([paths.theme_scripts], ['theme-js']);
gulp.watch([paths.htmltemplates], ['custom-templates']);
gulp.watch([paths.index], ['usemin']);
gulp.watch([paths.app_js], ['app-js']);
});
/**
* Live reload server
*/
gulp.task('webserver', function() {
connect.server({
root: '../src/main/webapp/',
livereload: true,
port: 5555
});
});
gulp.task('livereload', function() {
// gulp.src(['../src/main/webapp/**/*.*'])
// .pipe(watch())
// .pipe(connect.reload());
});
/**
* Gulp tasks
*/
gulp.task('build', ['usemin', 'build-assets', 'build-custom']);
gulp.task('default', ['build', 'webserver', 'livereload', 'watch']);