Introspect failed at xyz.openbmc_project.Hwmon.external

[manojdesd]

Issue : Introspect failed at xyz.openbmc_project.Hwmon.external

Steps :

1. Compile Phosphor-PID-control and flash the image and run the service in the machine.
2. In journal log could see this error:
   phosphor-mapper[1516]: Introspect call failed with error: generic:53, Invalid request descriptor on process: xyz.openbmc_project.Hwmon.external path: /
3. busctl tree xyz.openbmc_project.Hwmon.external command also shows object '/' missing
   
4. busctl tree for xyz.openbmc_project.State.FanCtrl
   
5. Which means only on creating the hwmon.external i am facing issue. Please help.

For your reference:
The phosphor-pid-control.bbappend file contents:
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
EXTRA_OECONF_append = "--enable-configure-dbus=yes"
SRC_URI_append = " file://config-bullhwmipcs.json"

#SRC_URI_append = " file://fan-reboot-control.service"
#FILES_${PN}append = " ${bindir}/fan-full-speed.sh"
FILES${PN}_append = " ${datadir}/swampd/config.json"

RDEPENDS_${PN} += "bash"

SYSTEMD_SERVICE_${PN}append = " phosphor-pid-control.service"
#SYSTEMD_SERVICE${PN}_append = " fan-reboot-control.service"

do_install_append() {
install -d ${D}${datadir}/swampd
install -m 0644 -D ${WORKDIR}/config-bullhwmipcs.json ${D}${datadir}/swampd/config.json

 install -m 0644 ${WORKDIR}/phosphor-pid-control.service \
    ${D}${systemd_unitdir}/system

}

Kindly help me to solve this issue. What am I missing ?