Stepper online A6 Servo motor as Spindle motor

Very difficult to say, you give me no clues.
You have to show the error messages from linuxcnc startup, that is the biggest help.
I kind of think you have not installed the component?
"sudo halcompile --install cia402pv.comp"
should put the component in the right place.
Anyway, I have to see the errors you get. A general description is not enough.

sudo halcompile --install cia402pv.comp

cnc@raspberrypi:~$ sudo halcompile --install cia402pv.comp
Traceback (most recent call last):
File "/usr/bin/halcompile", line 1553, in <module>
main()
File "/usr/bin/halcompile", line 1523, in main
process(f, mode, outfile)
File "/usr/bin/halcompile", line 1363, in process
a, b = parse(filename)
^^^^^^^^^^^^^^^
File "/usr/bin/halcompile", line 434, in parse
f = open(filename).read()
^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'cia402pv.comp'

Print file information:
RUN_IN_PLACE=no
LINUXCNC_DIR=
LINUXCNC_BIN_DIR=/usr/bin
LINUXCNC_TCL_DIR=/usr/lib/tcltk/linuxcnc
LINUXCNC_SCRIPT_DIR=
LINUXCNC_RTLIB_DIR=/usr/lib/linuxcnc/modules
LINUXCNC_CONFIG_DIR=
LINUXCNC_LANG_DIR=/usr/lib/tcltk/linuxcnc/msgs
INIVAR=inivar
HALCMD=halcmd
LINUXCNC_EMCSH=/usr/bin/wish8.6
LINUXCNC - 2.9.6
Machine configuration directory is '/home/cnc/linuxcnc/configs/probe_basic_dev'
Machine configuration file is 'EL8_machine.ini'
INIFILE=/home/cnc/linuxcnc/configs/probe_basic_dev/EL8_machine.ini
VERSION=1.1
PARAMETER_FILE=linuxcnc.var
TPMOD=
HOMEMOD=el8_homecomp
TASK=milltask
HALUI=halui
DISPLAY=probe_basic
COORDINATES=X Y Z
KINEMATICS=trivkins coordinates=XYZ
Starting LinuxCNC...
Starting LinuxCNC server program: linuxcncsvr
Loading Real Time OS, RTAPI, and HAL_LIB modules
Starting LinuxCNC IO program: io
Starting HAL User Interface program: halui
linuxcnc TPMOD=tpmod HOMEMOD=el8_homecomp EMCMOT=motmod
Found file(REL): ./hallib/EL8_machine.hal
Shutting down and cleaning up LinuxCNC...
Removing HAL_LIB, RTAPI, and Real Time OS modules
Removing NML shared memory segments

Debug file information:
Note: Using POSIX realtime
cia402pv: dlopen: /usr/lib/linuxcnc/modules/cia402pv.so: cannot open shared object file: No such file or directory
./hallib/EL8_machine.hal:9: waitpid failed /usr/bin/rtapi_app cia402pv
./hallib/EL8_machine.hal:9: /usr/bin/rtapi_app exited without becoming ready
./hallib/EL8_machine.hal:9: insmod for cia402pv failed, returned -1
2207
Stopping realtime threads
Unloading hal components
Note: Using POSIX realtime

Be in the directory were you have downloaded cia402pv.comp
and there do "sudo halcompile --install cia402pv.comp"

Easy to spot with the error messages, that helps a lot.

Hi Hakan
Thanks for the help I have configured to the directory now, but have a new error message ?

Print file information:
RUN_IN_PLACE=no
LINUXCNC_DIR=
LINUXCNC_BIN_DIR=/usr/bin
LINUXCNC_TCL_DIR=/usr/lib/tcltk/linuxcnc
LINUXCNC_SCRIPT_DIR=
LINUXCNC_RTLIB_DIR=/usr/lib/linuxcnc/modules
LINUXCNC_CONFIG_DIR=
LINUXCNC_LANG_DIR=/usr/lib/tcltk/linuxcnc/msgs
INIVAR=inivar
HALCMD=halcmd
LINUXCNC_EMCSH=/usr/bin/wish8.6
LINUXCNC - 2.9.6
Machine configuration directory is '/home/cnc/linuxcnc/configs/probe_basic_dev'
Machine configuration file is 'EL8_machine.ini'
INIFILE=/home/cnc/linuxcnc/configs/probe_basic_dev/EL8_machine.ini
VERSION=1.1
PARAMETER_FILE=linuxcnc.var
TPMOD=
HOMEMOD=el8_homecomp
TASK=milltask
HALUI=halui
DISPLAY=probe_basic
COORDINATES=X Y Z
KINEMATICS=trivkins coordinates=XYZ
Starting LinuxCNC...
Starting LinuxCNC server program: linuxcncsvr
Loading Real Time OS, RTAPI, and HAL_LIB modules
Starting LinuxCNC IO program: io
Starting HAL User Interface program: halui
linuxcnc TPMOD=tpmod HOMEMOD=el8_homecomp EMCMOT=motmod
Found file(REL): ./hallib/EL8_machine.hal
Shutting down and cleaning up LinuxCNC...
Removing HAL_LIB, RTAPI, and Real Time OS modules
Removing NML shared memory segments

Debug file information:
Note: Using POSIX realtime
HAL: ERROR: function 'cia402pv.Spindle.read-all' not found
./hallib/EL8_machine.hal:18: addf failed
2439
Stopping realtime threads
Unloading hal components
Note: Using POSIX realtime