Hi there,

I am trying to solve the following system of nonlinear equations

```
using JuMP, Ipopt
c = Model(with_optimizer(Ipopt.Optimizer,max_cpu_time=500.0))
@variable(c,x)
@variable(c,y)
@NLconstraint(c,(1/x)*(2+(0.5)/(x-y)-y^2) == 0)
@NLconstraint(c,(1/(x^2))*(-2*y -(0.5)*(y/(x-y))+(1/3)*y^3+0.5*log(x-y)) == 0)
@NLconstraint(c, x >= y + 0.001)
optimize!(c)
```

but I get an error message, “The equality constraints contain an invalid number”. I cannot understand what is being referred to.

Any hint would be most appreciated, thanks