Redwood - Error when creating Succession Plan from Succession Org. Chart

Hello Experts,

When creating a Succession Plan through the Succession Organization Chart feature, the system doesn't allow me to proceed, as I receive an error "Error response during RestAction" (screenshot below). The same behaviour if I click 'Add to Succession Plan' button, the same error appears.

However, I am able to create a succession plan if I follow the path My Client Groups > Succession Plans > Add

Does anyone have any idea why this is happening? I believe it is not related with privileges since I can create it through the path above.

Thank you and best regards,

Filipe