Building Nsis installer with Jenkins on MacOS Slave

I am trying to compile a Windows 64bit installer on a MacOS computer. Which is set as a slave for Jenkins. I get the error message below:

Generating language tables... Unable to convert processed string "De�nstallatieprogramma gemaakt: " to codepage 1252

I search my whole project for this string, but could not find it. Also when I compile the installer directly on this MacOS computer I do not get this error message.

Anyone know how to solve this?

"Deïnstallatieprogramma gemaakt: " is in Dutch.nlf.

The easy solution is to just create a Unicode installer with "Unicode True" in your script?

The "ï" character is present in codepage 1252 so it should work. Perhaps IConv on this system is outdated?

Tnx again Anders, Unicode True did the trick!