```ruby
class Fluid < Cask
  url 'http://fluidapp.com/dist/Fluid_1.6.1.zip'
  homepage 'http://fluidapp.com/'
  version '1.6.1'
  sha1 '7de2fe4372e9d055bd2bb6f5afcefa549740a7ce'
  link :app, 'Fluid.app'
end
```

Remove :app designation from Fluid link
user
```ruby
class Fluid < Cask
  url 'http://fluidapp.com/dist/Fluid_1.6.1.zip'
  homepage 'http://fluidapp.com/'
  version '1.6.1'
  sha1 '7de2fe4372e9d055bd2bb6f5afcefa549740a7ce'
  link 'Fluid.app'
end
```
assistant