Too many + signs

seems that tads3 (frobtads 3.1.3; Linux) has issues with multiple sources, this is an example:

e3rooms.t(38): error: too many '+' signs in object definition - location not defined

the experiment 3 (e3) has three files: one, the main, e3rooms contains the rooms and fixed items, and e3items, the mobile items. all are smaller, and I checked the correct syntax multiple times.

Someone known about this issue, and a solution and/or workaround ?

I think I had a similar issue, I wasn’t including:

#include <adv3.h>
#include <en_us.h>

at the top of my separate files.

Thanks, now works as expected !

Best regards from Italy,
dott. Piergiorgio.