Error 512 when calling LUA scripts

[Mat2Vence]

Hi,
I have a time based lua script that is up and running for a while. It allows me to check if some network devices are connected or not.

However, I have tried for the first time to run an LUA script based on the "command on" of a given devices. Whatever I am putting in the LUA scripts, I am getting an Error 512 when the script is called.. I have tried the easiest script ever, but I am getting this error message.
I cannot figure out when it is comming from. Would yo uhave any suggestion?