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The variables in the MILP are not symbolic variables, i.e., not from the Symbolic Ring. The vector() command is failing in that step.
type(x)
<type 'sage.numerical.linear_functions.LinearFunction'>
You can rewrite your constraints like this
p.add_constraint(sum(_a*_x for _a,_x in zip(a1, [x,y])) + r*a1.norm(2) <= b1)
