Hello,

I am trying to get `NLopt`

to work but it just stops immediately and gives :FORCED_STOP. I tried the following but it looks like the algorithm isn’t even going into `_ff`

. Any thoughts? Thank you!

```
function ff(x)
return sum(x.^2)
#return sum(abs.(SSresid(mod_pars,x[1],x[2],x[3])));
end
function _ff(x)
try ff(x)
catch
println("error")
end
end
opt = Opt(:LN_SBPLX, 3);
opt.xtol_rel = 1e-1;
opt.min_objective = _ff;
(minf,minx,ret) = NLopt.optimize(opt, [1,25,0.1])
```