Official repositories appear empty after last Pacman-manager update

Usually sudo should not be used with pamac as it has a polkit and will ask for password when is needed.
On my end:

strawberry                                                                       1.0.18-2                extra 
    A music player aimed at audio enthusiasts and music collectors

You might also have missed this:

So, if you still have community there, could be the issue you have.
Then, we start again:

Then
sudo pacman -Syyu strawberry
or
pamac install strawberry
And let me know what error you get.

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