I'm struggling with launching scripts from FileMaker 16 Server Schedule

[ggt667]

$ exa -lT /Library/FileMaker\ Server/Data/Scripts/
drwxrwxr-x    - fmserver       7 Jan 16:20 /Library/FileMaker\ Server/Data/Scripts/
.rwxrwxr-x   48 fmserver       7 Jan 16:20 └── timestamptotmp.sh

here is the content of the script:
 

$ cat timestamptotmp.sh
#!/bin/bash

echo $( date ) >> /tmp/timestamp.txt

The script runs fine as user fmserver when ran from command line and as any other user on the system as follows:
 

sudo su
su fmserver

/Library/FileMaker\ Server/Data/Scripts/timestamptotmp.sh
/Library/FileMaker\ Server/Data/Scripts/timestamptotmp.sh
/Library/FileMaker\ Server/Data/Scripts/timestamptotmp.sh
/Library/FileMaker\ Server/Data/Scripts/timestamptotmp.sh
/Library/FileMaker\ Server/Data/Scripts/timestamptotmp.sh

$exa -lT /tmp/
drwxrwxrwt   - root           7 Jan 16:31 /tmp
.rw-r--r-- 140 fmserver       7 Jan 16:46 └── timestamp.txt

 

$ tail -f /tmp/timestamp.txt
Mon Jan 7 16:31:22 CET 2019
Mon Jan 7 16:46:40 CET 2019
Mon Jan 7 16:46:44 CET 2019
Mon Jan 7 16:46:47 CET 2019
Mon Jan 7 16:46:55 CET 2019

When I try to run this script from the scheduler the error is "User Aborted" for type System Script; and "Script is Missing or is invalid" when ran as part of a Script Sequence.

Anyone with experience in this? I have solved the issue "User Aborted" `chmod 777 /Library/FileMaker\ Server/Data/Scripts/` So I can run some "System Script"s, but for "Script Sequence" the same scripts that runs as "System Scripts" does not run.

I suspect wrong error message.

I find no details in FileMaker Server console logs, and`tail -f /var/log/system.log` also has no more info.

However here I find the actual error:
 

$ tail -f /Library/FileMaker\ Server/Logs/stderr
fmshelper: failed to exec() '/Volumes/FMTestServer/Library/FileMaker Server/Data/Scripts/timestamptotmp.sh', error Exec format error

 

Edited January 7, 2019 by ggt667