xymon 4.3.24 alerts.cfg Argument list too long

Hello,
I've compiled xymon 4.3.24 from source on a redhat 6.7 64bit
Now when I setup a SCRIPT in alerts.cfg I get this error:

2016-01-19 15:14:49.091235 Could not launch paging script /tmp/test_alert.sh: Argument list too long

On another (older) installation the script works fine? What I got wrong?
Here is the entry in alerts.cfg

HOST=firfs1.mil.esselunga.net SERVICE=ftp
SCRIPT /tmp/test_alert.sh test FORMAT=SCRIPT REPEAT=1


MAIL works fine

Thanks

Luca