It would be useful if you could give us the context in which this error 
occurred.  Was it in a demo or your own application?

Regards,
Dave

On Jan 7, 2014, at 8:26 AM, Fangyuan Cheng 
<[email protected]> wrote:

> Dear sir or madam,
> 
> I encountered problems when running fenics solver, which error message I 
> cannot understand. Please see below:
> 
>  Error:   Unable to access vector of degrees of freedom.
> *** Reason:  Cannot access a non-const vector from a subfunction.
> *** Where:   This error was encountered inside Function.cpp.
> *** Process: 0
> *** 
> *** DOLFIN version: 1.2.0+
> *** Git changeset:  
> 
> What is the directory to find the Funciton.cpp? Or is it included in some 
> other file? Could you please kindly explain what the error message is saying 
> and some advice to solve this problem.
> 
> Thank you very much for your time and help.
> 
> Regards,
> 
> Fangyuan Cheng
> Structural Engineer
> 
> Fairlead Maritime
> Unit 45, Riverside Building
> 55 Trinity Buoy Wharf
> London E14 0FP
> 
> http://www.fairleadmaritime.co.uk
> 
> +44 207 515 9977
> +44 7789375573
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