Scripts

In general, I looked at the comments the script editor was writing; it complained that another end should be added. Now the script looks like this:
Trigger(NEW_DAY_TRIGGER, "hello");
function hello()
if GetDate(DAY)==0 then
MessageBox(GetMapDataPath().."message.txt");
end;
end
At the bottom, it says "syntax successfully checked," but in the game itself, nothing still happens:(
P.S. When opening the map itself, even before I click MapScript.lua, the editor with an error sign says "An invalid character was found in text content" Line: 79392 < Item >, could this be the problem? But then what is it and how can I fix it?

At the bottom, it says "syntax successfully checked," but in the map itself, even before I click MapScript.lua, the editor with an error sign says "An invalid character was found in text content" Line: 79392 < Item >, could this be the problem? But then what is it and how can I fix it?