Why is it that whenever I try to compile a binary variable, Julia returns this error to me?

```
In @variable(ModeloD,b[A],lower_bound = 0,Bin): Unrecognized keyword argument lower_bound
```

Is there a different way of putting the major and minor signs in binary variables in a robust model?

I’ve tried to use all of these and the error continues: `<=,> =,. <=,.> =, Lower_bound = 0, upper bound = 0`

```
using JuMP, JuMPeR, GLPKMathProgInterface
ModeloD = RobustModel(solver = GLPKSolverLP())
a = 1:4
A = a
@variable(ModeloD,b[A], lower_bound=0, Bin)
```