In options dialogs of NLPSolver, you read "Size of Swam:" instead of "Size of Swarm:".
To fix this typo one have to modify the file /opt/libreoffice/share/extensions/NLPSolver/locale/NLPSolverCommon_en_US.properties, line 5 :
NLPSolverCommon.Properties.SwarmSize=Size of Swarm
I did not find this file in the source code.
Best regards. JBF
It was fixed by the commit below:
Closing - Sophie