# Unable to make sense of Maxima Expression as result of integration

Hi,

with sage 7.1 I tried to compute the following integral. I am not sure it has a closed form expression, that is what I wanted to see.

```
maxima._eval_line(":lisp (ext:set-limit 'ext:heap-size 0)",
wait_for_prompt=False)
```

`from sage.symbolic.integration.integral import definite_integral`

`var('k')`

`definite_integral(sin(k*x)/x*erf(x^2), x, 0, oo)`

What I get is

`TypeError: unable to make sense of Maxima expression '\\*z\\*' in Sage`

Nothing useful turned up when I googled for it. What does it mean and what is going wrong?

Thank you

See http://trac.sagemath.org/ticket/20467