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Computing Galois group of a polynomial?

Here's my attempt so far:

x = polygen(QQ, 'x');
K.<z> = NumberField(x^4+x^2+2*x+1)
G = K.galois_group(type='gap')

And now I get several pages of error messages beginning with

verbose 0 (1780:, cardinality) Warning: TransitiveGroups requires the GAP database package. Please install it with ``sage -i database_gap``.

However! - I have installed this:



Anybody got any ideas on where I can go from here?