This problem was reported by Daniel Perez (daniel dot perez at mol dot biol dot ethz dot ch) in the
post at https://mail.gna.org/public/relax-users/2006-10/msg00043.html (Message-id:
<453C7154.4040603@...>).
In case this fix isn't for the same problem (no traceback was provided), the error message that this
solves is reproduced at https://mail.gna.org/public/relax-users/2006-10/msg00045.html (Message-id:
<7f080ed10610230104w3a873225hd5481581886efacf@...>).
The problem was the the function 'return_values' in the file 'specific_fns/jw_mapping.py' was
a copy of an ancient function which did not support MC simulation data. All other types of analysis
were using the function from their common base class. By deleting this ancient code, the base class
function is utilised and the grace.write() user function now works with simulation data.
