# Error: odeint not implemented!

**URL:** <https://discourse.opengeosys.org/t/error-odeint-not-implemented/745>\
**Category:** ogs-users\
**Tags:** ogs5\
**Created:** [April 9, 2021, 2:50pm UTC](https://discourse.opengeosys.org/t/error-odeint-not-implemented/745 "2021-04-09T14:50:46Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![andreamanzoni](https://discourse.opengeosys.org/user_avatar/discourse.opengeosys.org/andreamanzoni/32/952_2.png) [@andreamanzoni](https://discourse.opengeosys.org/u/andreamanzoni)\
**Post date:** [April 9, 2021, 2:50pm UTC](https://discourse.opengeosys.org/t/error-odeint-not-implemented/745/1 "2021-04-09T14:50:46Z")

</div>

Dear all,  
I am a new user and I am currently using OGS5.7 (downloaded at this link [OpenGeoSys-5](https://www.opengeosys.org/ogs-5/)) I’m actually following the tutorial of the book: OpenGeoSys Tutorial Computational Hydrology II: Groundwater Quality Modeling.  
When I execute the code, I have encountered the following problem:

```
 ExecuteKineticReactions
Error: odeint not implemented!
Warning in CKinReactData::Biodegradation: Odeint did not converge at node 0.
   -Trying increased relative error 1e-05
Error: odeint not implemented!
  -Trying perturbation of initial time step usedt
Error: odeint not implemented!
   -Trying conversion of C vector from double to float.
Error: odeint not implemented!
   -Trying perturbation of concentration vector by 1 per mil
Error: odeint not implemented!
   -Trying increased relative error 0.0001
Error: odeint not implemented!
  ODE integration finally failed. Skipping this node.

```

I have also tried to execute the tutorial 1d\_xylene\_degradation available on-line but i encounter the same error.  
Does anyone know what does it means and how to fix this problem?

Thank you in advance,

Andrea