# Debugging Numerical ice sheet modelling using FEniCS **URL:** \ **Category:** Errors\ **Created:** [October 19, 2021, 9:26pm UTC](https://fenicsproject.discourse.group/t/debugging-numerical-ice-sheet-modelling-using-fenics/6860 "2021-10-19T21:26:59Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [October 19, 2021, 9:39pm UTC](https://fenicsproject.discourse.group/t/debugging-numerical-ice-sheet-modelling-using-fenics/6860/2 "2021-10-19T21:39:19Z")
To me it seems like your `StokesSolver` does not return anything. It should return the solution `w`. Please follow the guidelines about posting a minimal code example: > [@Read before posting: How do I get my question answered?](https://fenicsproject.discourse.group/t/read-before-posting-how-do-i-get-my-question-answered/21): > > Here are a few tips to help get your question answered: Phrase the title of your post as a question and make it meaningful. Check that your question hasn’t been asked before using the search functionality. Post a “minimum working code example” (MWE) to illustrate the problem: A MWE is the simplest piece of code that reproduces or explains the problem you have. It must be possible to take the MWE, paste it into a file and run it, without any extra modifications. Good MWEs can be as little as … --- _[View the full topic](https://fenicsproject.discourse.group/t/debugging-numerical-ice-sheet-modelling-using-fenics/6860)._