EISDIR error

[patrick-wc]

Just today I started getting this error when compiling any of my projects that use grunt-contrib-cssmin

Running "cssmin:target" (cssmin) task

> > Source file ie.css not found
> > Source file login.css not found
> > Source file nomq.css not found
> > Warning: Unable to write "library/css/build" file (Error code: EISDIR). Use --force to continue.

Aborted due to warnings.

What's weird is it clearly did find the files, ie.css, login.css and nomq.css because it lists them. I'm using the same syntax as from the documentation example:

cssmin: {
  target: {
    files: [{
      expand: true,
      cwd: 'release/css',
      src: ['*.css', '!*.min.css'],
      dest: 'release/css',
      ext: '.min.css'
    }]
  }
}

I've been using this for more than a year without any troubles. Now for some reason all of my projects won't compile. I managed to fix it by manually specifying the files, e.g.:

cssmin: {
            css:{ 
                files: {
                  'css/build/ie.min.css': ['css/build/ie.css'],
                  'css/build/login.min.css': ['css/build/login.css'],
                  'css/build/nomq.min.css': ['css/build/nomq.css']
                }
            } 
        }

It seems really strange that this would suddenly happen. I'm using Windows 10, I didn't run npm update or anything.

[truckingsim]

Can confirm, having same problem. Manual fix listed above also made it work for me. I'm using Ubuntu 14.04. I had just installed this plugin today.

[XhmikosR]

Something else is keeping the handle open; antivirus software etc.