Can't run manually the backend because it can't find xmerl lib

[Effeo]

i'm trying to run manually the backend but it can't complie p1_edoc_layout.erl because it can't find lib xmerl.hrl, i tried to add it in the mix.exs but still nothing.

Error:
===> Compiling src/p1_edoc_layout.erl failed
src/p1_edoc_layout.erl:{35,14}: can't find include lib "xmerl/include/xmerl.hrl"; Make sure xmerl is in your app file's 'applications' list

** (Mix) Could not compile dependency :p1_utils,