Compile & compress SASS on deploybot with Grunt - deployment

Question

I've got a grunt task to compile & compress my JS & SASS files which all works fine locally but when I try using it on deploybot.com I just get an error stating:
sass sass/main.scss public/css/main.css --style=compressed --no-cache
This is my grunt file:
module.exports = function(grunt){
grunt.initConfig({
concat:{
options:{
stripBanners: true,
sourceMap: true,
sourceMapName: 'src/js/jsMap'
},
dist:{
src: ['js/vendor/jquery.slicknav.js', 'js/vendor/swiper.js', 'js/app/*.js'],
dest: 'src/js/main.js'
},
},
copy:{
js:{
files:[
{ src: 'src/js/main.js', dest: 'public/js/main.js', },
{ src: 'src/js/jsMap', dest: 'public/js/jsMap', }
],
},
},
uglify:{
production:{
options:{
sourceMap: true,
sourceMapIncludeSources: true,
sourceMapIn: 'src/js/jsMap', // input sourcemap from a previous compilation
},
files: {
'public/js/main.js': ['src/js/main.js'],
},
},
},
sass:{
dev:{
options:{
style: 'expanded'
},
files:{
'public/css/main.css': 'sass/main.scss'
}
},
production:{
options:{
style: 'compressed',
noCache: true
},
files:{
'public/css/main.css': 'sass/main.scss'
}
}
},
watch: {
dev:{
files: ['js/**/*.js', 'sass/*.scss'],
tasks: ['build-dev'],
options: {
spawn: false,
interrupt: true,
},
},
},
});
grunt.loadNpmTasks('grunt-contrib-concat');
grunt.loadNpmTasks('grunt-contrib-copy');
grunt.loadNpmTasks('grunt-contrib-uglify');
grunt.loadNpmTasks('grunt-contrib-sass');
grunt.loadNpmTasks('grunt-contrib-watch');
grunt.registerTask('build-dev', ['concat', 'copy:js', 'sass:dev']);
grunt.registerTask('build-prod', ['concat', 'uglify:production', 'sass:production']);
grunt.registerTask("watch-dev", ['watch:dev']);
};
These are the commands I'm running to compile & compress my code, all the version specific stuff was to try and fix the problem I have the same issue when remove it.
nvm install 0.10.25
nvm use 0.10.25
npm uninstall grunt -g
npm install grunt-cli -g
npm install grunt#0.4.5 --save-dev
npm install -g grunt-cli
npm install --save-dev
grunt build-prod --stack --verbose --debug
This is what is shown in the log file after the node & grunt install bits:
output Loading "Gruntfile.js" tasks...OK
output + build-dev, build-prod, watch-dev
output Running tasks: build-prod
output Running "build-prod" task
output [D] Task source: /source/Gruntfile.js
output Running "concat" task
output [D] Task source: /source/node_modules/grunt-contrib-concat/tasks/concat.js
output Running "concat:dist" (concat) task
output [D] Task source: /source/node_modules/grunt-contrib-concat/tasks/concat.js
output Verifying property concat.dist exists in config...OK
output Files: js/vendor/jquery.slicknav.js, js/vendor/swiper.js, js/app/centre-events-boxes.js, js/app/centre-footer.js, js/app/club.move-nav.js, js/app/club.social-link-position.js, js/app/func.stick-to-top.js, js/app/home.move-nav.js, js/app/home.stick-to-top.js, js/app/match-event-box-height.js, js/app/slicknav.js, js/app/swiperjs-slider.js -> src/js/main.js
output Options: separator="\n", banner="", footer="", stripBanners, process=false, sourceMap, sourceMapName="src/js/jsMap", sourceMapStyle="embed"
output Reading js/vendor/jquery.slicknav.js...OK
output Reading js/vendor/swiper.js...OK
output Reading js/app/centre-events-boxes.js...OK
output Reading js/app/centre-footer.js...OK
output Reading js/app/club.move-nav.js...OK
output Reading js/app/club.social-link-position.js...OK
output Reading js/app/func.stick-to-top.js...OK
output Reading js/app/home.move-nav.js...OK
output Reading js/app/home.stick-to-top.js...OK
output Reading js/app/match-event-box-height.js...OK
output Reading js/app/slicknav.js...OK
output Reading js/app/swiperjs-slider.js...OK
output Writing src/js/jsMap...OK
output Source map src/js/jsMap created.
output Writing src/js/main.js...OK
output File src/js/main.js created.
output Running "uglify:production" (uglify) task
output [D] Task source: /source/node_modules/grunt-contrib-uglify/tasks/uglify.js
output Verifying property uglify.production exists in config...OK
output Files: src/js/main.js -> public/js/main.js
output Options: banner="", footer="", compress={"warnings":false}, mangle={}, beautify=false, report="min", expression=false, maxLineLen=32000, ASCIIOnly=false, screwIE8=false, quoteStyle=0, sourceMap, sourceMapIncludeSources, sourceMapIn="src/js/jsMap"
output Minifying with UglifyJS...Reading src/js/jsMap...OK
output Parsing src/js/jsMap...OK
output Reading src/js/main.js...OK
output OK
output Writing public/js/main.js...OK
output Writing public/js/main.js.map...OK
output File public/js/main.js.map created (source map).
output File public/js/main.js created: 192.88 kB → 77.01 kB
output >> 1 sourcemap created.
output >> 1 file created.
output Running "sass:production" (sass) task
output [D] Task source: /source/node_modules/grunt-contrib-sass/tasks/sass.js
output Verifying property sass.production exists in config...OK
output Files: sass/main.scss -> public/css/main.css
output Options: style="compressed", noCache
output Command: sass sass/main.scss public/css/main.css --style=compressed --no-cache
output Errno::EISDIR: Is a directory # rb_sysopen - public/css/main.css
output Use --trace for backtrace.
output Warning: Exited with error code 1 Use --force to continue.
output Aborted due to warnings.
I've been trying to fix this for days and have no ideas. I've tried contacting their support too.

Answer 1

Turns out after contacting their support team multiple times the problem was on their end, something to do with a caching mechanism I think. Nothing I could do to solve it without their support though.