@ginobean Thanks, this can happen if you just compile ES (cmake / make) without any previous ES binary installation (or removed the previous binary installation).
FWIW, it should be no issue if you run sudo RetroPie-Setup/retropie_packages.sh emulationstation-dev unless you have a very dated (if not end-of-life OS) like these version (or even older):Debian Jessie LinuxMint 18 Ubuntu 16.10 Zorin 14 ElementaryOS 0.4
and/or a very dated retropie_setup.sh script .
These versions are tested in scriptmodules/system.sh , if they report an OS Version of 8 the resources folder is not copied by scriptmodules/supplementary/emulationstation[-dev].sh.
NB: The above retropie_packages.sh calls eventually the scriptmodule emulationstation-dev.sh (which is an wrapper around scriptmodule emulationstation.sh).
If you want to keep the sources of ES (below RetroPie-Setup/tmp/build/) then runretropie_packages.sh emulationstation-dev sources retropie_packages.sh emulationstation-dev build retropie_packages.sh emulationstation-dev install