[AMPL 25000] Location Problem

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Your constraint named Constraint_coverage looks good. Of course, your model needs to also include AMPL statements to define the sets and parameters that are used in the constraint; for example:

set Sites;
set DemandSites;
param d {DemandSites,Sites};
param demand {DemandSites};

I do have some concerns with your objective function Total_Cost:

minimize Total_Cost:
  sum {i in DemandSites, j in Sites, k in Types} F[k} * Xjk[j,k];

Of course, F[k} should be F[k]. More seriously, you are summing over i in DemandSites, but there is no i in F[k] * Xjk[j,k]. This could mean that something is missing from the objective expression.