Why isn't my Google music manager working?

I am trying to upload my music to Google music manager, so I am following the steps posted in the android authority:
1. Launch music manager on my computer and logged-in with my google account. However, when I do so I get a message: "please sign in to the Google play music player on the web before using music manager". So, then I click on "go to music player" and the page goes blank.
What could be the problem ?

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