Picoserver and Picotcp apps not building for me

Hi, I’m having trouble building any of the picotcp/ picoserver applications in the camkes manifest for any platform and one of the errors I get is.

ERROR:CAmkES:/home/nkem/dw-test/projects/camkes/apps/picoserver/picoserver.
camkes:51:19:
component PicoServer picoserver;
ERROR:CAmkES:
^^^^^^^^^^^^
ERROR:CAmkES:non-optional interface picoserver.pico_tx is not connected
CMake Error at /home/nkem/dw-test/projects/camkes-tool/camkes.cmake:545 (me
ssage):
Failed to generate /home/nkem/dw-test/build/ast.pickle
Call Stack (most recent call first):
CMakeLists.txt:46 (GenerateCAmkESRootserver)

I don’t think I have missed any of the required building dependencies. Any help would be appreciated.