[dune-pdelab] Unknown exception

[Christian Engwer]

I assume your code doesn't contain a catch statement for
std::exception. The log states that an instance of
'std::ios_base::failure' is thrown. You will learn more if you catch
the exception and print it the same way you print the dune
exceptions, i.e. "std::cout << e.what();". It's an IO error. My
crystal ball suggests that you are trying to write a vtk file into a
sub folder and this folder doesn't exist. Might this be? If not the
try-catch-print will tell you more

Christian

On Wed, Sep 02, 2015 at 08:49:07PM +0200, conf86 at web.de wrote:
> I don't know if this DUNE related enough to be asked here, but I got the "unknown exception" error during calculation.
> 
> I executed the program and it calculated 263 time steps, then I got the error:
> 
> TIME STEP [Alexander (order 2)]    263 time (from):   2.6200e+1 dt:  
> 1.0000e-1 time (to):   2.6300e+1
> STAGE 1 time (to):   2.6229e+1.
> === matrix setup skipped (matrix already allocated)
> === matrix assembly (max) 0.07737 s
> === residual assembly (max) 0.009837 s
> === solving (reduction: 1e-10) 0.003325 s
> STAGE 2 time (to):   2.6300e+1.
> === matrix setup skipped (matrix already allocated)
> === matrix assembly (max) 0.05561 s
> === residual assembly (max) 0.008909 s
> === solving (reduction: 1e-10) 0.003059 s
> ::: timesteps         263 (263)
> ::: nl iterations    1575 (1575)
> ::: lin iterations   1575 (1575)
> ::: assemble time    4.0507e+01 (4.0507e+01)
> ::: lin solve time   1.6890e+00 (1.6890e+00)
> Unknown exception thrown!
> terminate called after throwing an instance of 'std::ios_base::failure'
>   what():  basic_ios::clear
> Aborted (core dumped)
> 
> The calculated data also look normal until the 263th step.
> The calculations were fine previously, the only thing I did was changing some parameters/terms in the code and the mesh (unfortunately I didn't make any backup). I tried to change it back, but the error remained. 
> 
> Do you have any idea where this might come from? 
> 
> 
> Best regards
> 
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