Thanks, I solved the above problem by reinstalling the software.
However, I encountered a new problem.
I set up a model controlled by two equations,Navier-Stokes equations and heat transfer equation. when i use built-in Laminar flow model, i can solve the results. But when i use fenics solver, the following errors occur:
![](https://forum.featool.com/file/n1336/Error_2022_10_22_11_43_50.png)
![](https://forum.featool.com/file/n1336/Error_2022_10_22_11_44_11.png)
How to work out the problem?
I appreciate your reply.