module 'cyipopt' has no attribute 'Problem'

[Nlanglet]

Hello.
In order to develop a topological optimisation code, I decided to use Fenics, dolphin adjoint and cyipopt. Unfortunately when I try the tutorial I get:

line 73, in
nlp = cyipopt.Problem(
AttributeError: module ‘cyipopt’ has no attribute ‘Problem’.

I'm using an anaconda (anaconda/2021.05) environment and when I do conda list I get :

cyipopt 0.1.9 py37hc1659b7_1000 conda-forge
ipopt 3.12.12 blas_openblash746e5da_1001 [blas_openblas] conda-forge

and all other installed modules. I also use python 3.7.16. Am I doing something wrong ?

I have also tried with miniconda 23.1.0 with cyipopt 1.5.0 and i got the same problem.

Thank you in advance

[moorepants]

The latest version of cyipopt is 1.5.0, 0.1.9 is no longer supported.

[moorepants]

If you install 0.1.9, Problem did not exist then.