unable to enable/disable boot-start in splunk forwarder for RHEL6 "Red Hat Enterprise Linux Server release 6.10 (Santiago)"

Trying to installing 8.0.2.1 version of splunk UF on "Red Hat Enterprise Linux Server release 6.10 (Santiago)".

2.6.32-754.35.1.el6.x86_64

cammand:

"{{ splunk_home }}/bin/splunk enable boot-start-user {{ splunk_user }} -systemd-managed 0 --answer-yes
--auto-ports --no-prompt --accept-license"

"stderr": "execve: No such file or directory\n while running command /sbin/chkconfig", "stderr_lines": ["execve: No such file or directory", " while running command /sbin/chkconfig"],


debug mode:

fatal: [RHEL6servername]: FAILED! => {
"changed": false,
"cmd": [
"/opt/splunkforwarder/bin/splunk",
"disable",
"boot-start"
],
"delta": "0:00:00.013908",
"end": "2021-07-29 10:37:22.942779",
"invocation": {
"module_args": {
"_raw_params": "/opt/splunkforwarder/bin/splunk disable boot-start",
"_uses_shell": false,
"argv": null,
"chdir": null,
"creates": null,
"executable": null,
"removes": null,
"stdin": null,
"stdin_add_newline": true,
"strip_empty_ends": true,
"warn": true
}
},
"msg": "non-zero return code",
"rc": 8,
"start": "2021-07-29 10:37:22.928871",
"stderr": "execve: No such file or directory\\n while running command /sbin/chkconfig",
"stderr_lines": [
"execve: No such file or directory",
" while running command /sbin/chkconfig"
],
"stdout": "",
"stdout_lines": []
}