INVALID_CLIENT: Invalid client when trying to set up spotify.

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I am using version 0.9.3

I have my redirect url set to http://localhost:80.

Within the audio band settings I have set callback port and proxy port to 80.
I have also filled in Client ID and Client Secret.
I have not filled in anything else.

When I select spotify in audio sources it opens up a page that says : "INVALID_CLIENT: Invalid client"

I have tried to change redirect url to http://localhost:1234 and I changed Client ID and Client secret to 1234 but the same issue occurs.

Maybe I am doing something wrong ?
Any help would be appreciated.