unable insert and run cli script to tmos

Hi all  , 

Can somebody advice what is the correct step to insert the cli script into the F5 system. it is appreciate for any comment or advice given.  

i am facing an error as i with enable auto enrollment of data into datagroup with google authenticator solution with link below . 
https://github.com/yamashin55/f5-google-authenticator-datagroup/blob/master/index.mdf5-google-authenticator-datagroup/index.md at master · yamashin55/f5-google-authenticator-datagroup (github.com)

Base on the step , when #tmsh list cli script , it shall with positive result showing as below 

cli script add_totp_key {
proc script::run {} {
set cmd "tmsh::modify /ltm data-group internal [lindex $tmsh::argv 3] \{ records add \{ [lindex $tmsh::argv 1] \{ data [lindex $tmsh::argv 2] \} \} \}"
tmsh::log "Executing the command: $cmd"
eval $cmd
}
total-signing-status not-all-signed
}

Thus , i am go to tmsh command with work on this accordingly with put in the exactly same script.and it state is error . please see  below output with show error "total-signing-status" is a read-only property. Then , i am delete the syntax "total-signing-status not-all-signed" and system are allow without error.  

==TMSH CLI output 

root@(bigip01)(cfg-sync Standalone)(Active)(/Common)(tmos)# edit cli script add_totp_key

root@(bigip01)(cfg-sync Standalone)(Active)(/Common)(tmos)# edit cli script add_totp_key
Save changes? (y/n/e) y

Syntax Error: "total-signing-status" is a read-only property
There were errors. Continue editing(y) or discard changes(n) (y/n)

==TMSH output end == 

However , i proceed the test and i found my solution not working and i dig down it likely the script didnt process accordingly . Then i run another command #run cli script  add_totp_key,  it introduce an error message likely showing the script are not working as show below 

==tmsh output start ==

root@(bigip01)(cfg-sync Standalone)(Active)(/Common)(tmos)# run cli script
Configuration Items:
add_totp_key delete_totp_key f5.app_utils
Options:
file verbatim-arguments
root@(bigip01)(cfg-sync Standalone)(Active)(/Common)(tmos)# run cli script add_totp_key
add_totp_key: script failed to complete:
can't eval proc: "script::run"
"{" unknown property
while executing
"tmsh::modify /ltm data-group internal { records add { { data } } }"
("eval" body line 1)
invoked from within
"eval $cmd"
(procedure "script::run" line 4)
invoked from within
"script::run" line:1
script did not successfully complete, status:1
root@(bigip01)(cfg-sync Standalone)(Active)(/Common)(tmos)#

==tmsh output end  ==