Copying entities from another mod

[gottafindmydad]

Ive been trying to copy entities from the Rising Sun mod into a custom mod I have made. My mod requires Robz and I have already successfully implemented tanks from VLSS by copying and pasting the entities and then editing the desc files ect. Now I am trying to implement a few items from Rising Sun mod (specifically the browning_m1917) using the same method as before but I now the game crashes when I select the entity in the editor. the error message sites a problem with the desc. folder but I haven't figured out what the problem is. So any idea how to implement Rising Sun entities into a Robz compatible mod?

Here is a picture of the error i am getting
http://imgur.com/Hl36zsl


SOLVED** I was missing the set files.