Message

hi guys, I would like to know how to generate more than 16 messages; when I generate the seventeenth message, Linux throws an error.Tanks 

Seems the component is setup to only handle a maximum of 16 messages:
github.com/LinuxCNC/linuxcnc/blob/master...nts/message.comp#L90

Note that there is an enhanced message component in master that supports up to 64 messages which you might be able to install on your system using the 'halcompile' tool. (this tool will require installation of the 'linuxcnc-dev' package)
github.com/LinuxCNC/linuxcnc/blob/master...ponents/pushmsg.comp