NoMethodError undefined method `[]’ for “image”:Sass::Script::Value::String

When upgrading my Rails app to 4 (from 3), I was getting the error:

NoMethodError undefined method `[]’ for “image”:Sass::Script::Value::String

Eventually I found out that the asset-path / asset-url methods changed to only accept one argument.

For example,

asset-url(‘profile.png’, image)

now should be:

asset-url(‘profile.png’)

In my particular case, this code was in some of my css files.

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