# Model won't work. Unknown error message

**URL:** <https://forum.dynare.org/t/model-wont-work-unknown-error-message/1369>\
**Category:** Dynare help (legacy posts)\
**Created:** [5 March 2010 19:55 UTC](https://forum.dynare.org/t/model-wont-work-unknown-error-message/1369 "2010-03-05T19:55:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ewoudq](https://forum.dynare.org/letter_avatar_proxy/v4/letter/e/d26b3c/32.png) [@ewoudq](https://forum.dynare.org/u/ewoudq)\
**Post date:** [5 March 2010 19:55 UTC](https://forum.dynare.org/t/model-wont-work-unknown-error-message/1369/1 "2010-03-05T19:55:49Z")

</div>

Hi all,

I am working on a simple model, but I am not able to come up with a working one. I always get the following error message:

[code]??? Reference to non-existent field ‘ghs2’.

Error in ==\> disp\_dr at 60  
x = x + dr.ghs2(ivar(i))/2;

Error in ==\> stoch\_simul at 65  
disp\_dr(oo\_.dr,options\_.order,var\_list);

Error in ==\> heuristics4 at 148  
info = stoch\_simul(var\_list\_);

Error in ==\> dynare at 102  
evalin(‘base’,fname) ;[/code]

I have no idea what I am doing wrong, so I hope someone can give me a hint?

Thank you in advance!  
[heuristics4.mod](https://forum.dynare.org/uploads/default/original/1X/c7c65e6d14176235f81fe8e850140667d78a9405.mod) (790 Bytes)

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<div class="post-metadata">

**Author:** ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer)\
**Post date:** [6 March 2010 12:25 UTC](https://forum.dynare.org/t/model-wont-work-unknown-error-message/1369/2 "2010-03-06T12:25:00Z")

</div>

The error with your .mod-file on my machine with Dynare 4.1 and Win64bit is the following:

??? Error using ==\> dr1 at 198  
2nd and 3rd order approximation not implemented for purely backward models

Error in ==\> resol at 128  
[dr,info,M\_,options\_,oo\_] = dr1(dr,check\_flag,M\_,options\_,oo\_);

Error in ==\> stoch\_simul at 42  
[oo\_.dr, info] = resol(oo\_.steady\_state,0);

Error in ==\> heuristics4 at 177  
info = stoch\_simul(var\_list\_);

Error in ==\> dynare at 132  
evalin(‘base’,fname) ;

Using

```auto
stoch_simul(order=1);
```

instead of

```auto
stoch_simul;
```

seems to work.