Too much indentation.  Should be:

```python
"""This method creates a Wwinp object from a structured mesh object. 
The mesh must have tags in the form "ww_X_group_YYY" where X is n 
or p, and  YYY is the energy group. For every particle there must 
be a rootSet tag in the form X_e_upper_bounds containing a list of
energy upper bounds.
"""
```