AttributeError: 'gr_hier_block2_sptr' object has no attribute 'set_callback'

[Albert Hopkins]

On Thu, Feb 14, 2013, at 04:39 PM, Dave Angel wrote:
[... snip]

> For those of us using text-based email, the program in this message is 
> totally unreadable.  This is a text mailing-list, so please put your 
> email program in text mode, or you'll lose much of your audience.

For those of us not using not using text-based email, it looked just as
bad (if not worse).