Hi @PierreI and welcome to the forum -
I tried to reproduce your problem using the settings given, but so far I’ve not been able to. If you read the node description, it provides a little bit of information about the reference point under the “Compute hypervolume” setting:
“Enables the computation of the hypervolume enclosed by the Pareto front approximations. You need to provide a reference point which is dominated by all solutions. The reference point must be entered in the text field, with the coordinates separated by spaces. The number and order of coordinates must match the number and order of the objectives. Hypervolume computation is very expensive if more than two objectives are used, therefore an approximation algorithm is used.”
Along those lines, if you uncheck the “Compute Hypervolume” checkbox do you still run into trouble? And can you provide which operating system you’re using, and how much memory you have allocated to KNIME (per the knime.ini file)?