A Great Deluge algorithm, which has been introduced by [1], does not have a corresponding support in Solver Config editor in Decision Central. As a result, any attempt to add a Local Search phase fails with an error, which can be found in attachment.

[1] https://github.com/kiegroup/optaplanner/pull/513

Probable solution:

In the repo "optaplanner-wb", find in path for "LATE_ACCEPTANCE" or "TABU_SEARCH". You'll find 1 or 2 files that hard code the values of the LocalSearchType. Add "GREAT_DELUGE" in there. Also add in in the i18n properties file.
Submit it as a PR and see if Jenkins says if the full downstream build works fine.