### Error with semi-definite program solver

Hello,

I use sage 7.1 on a debian computer. I am trying to use the sdp solver, but:

```
p = SemidefiniteProgram()
omega = p.new_variable()
p.set_objective(omega[0])
p.add_constraint(matrix(1,[1]) * omega[0] <= matrix(1,[1]))
p.add_constraint(matrix(1,[1]) * omega[1] <= matrix(1,[1]))
p.show()
```

returns an error:

```
ValueError: need more than 1 value to unpack
```

What does it mean?

Antoine