Problems with the use of the Free Surface Module

Hello, I want to use the terrain data recorded on the free surface to see the change at the top, but with the speed file of GPlates to specify the boundary speed, the prompt does not work, why is that?
Here’s my model setup and error tips.Thank you.


@haohao - The error message actually succinctly points out the issue, which is that we currently do not allow a boundary to be specified to be both a free surface and have velocity constraints (this is also physically inconsistent).

This error should be resolved by removing the specification that the top boundary is a free surface in the Mesh deformation subsection.

Cheers,
John