Im having an issue related to the GENT walk model..

[Romulator]

In simple: If the map loads, no. Your mod or game will not break.

No, this shouldn't break your game. The error, if I'm reading it correctly, states that there is a block box entity (for whatever reason), attached to your tree's entity. You can look it over in the Model Editor and see if there is something there that shouldn't be.

Also, the msh problem simply states that there is a sub mesh missing. (A window, for example, the mesh is the overall design and the window is the submesh (could be wrong. Could just be two meshes. Don't hate)). That wouldn't/shouldn't be a problem anyway, since you delete the .msh files affiliated with the AMFP entities when you imported them into The Dark Descent's assets.

If I recall, AMFP hpl.log files have similar errors. You shouldn't have any problems.