Group Loop + Parameter Optimization Loop + X-Partitioner (cross validation) Error

Hello,

Is it possible to have Group Loop + Parameter Optimization Loop + X-Partitioner (cross validation) altogether?

I get “Can´t merge FlowVariable Stacks” error :sob:

I am able to make it work with “Parameter Optimization Loop + X-Partitioner” but not with Group Loop.

Anyone could help me, please?

THX