I just tried: 3DObjectFragLight-8.c3p and FragLightTrain.c3p and they worked for me. Make sure you are using the latest version of the effects and 3dobject addon. When using the latest 3DObject in 3DObjectFragLight-8.c3p, remove the main.js script from the project (the addon does the change itself.)
If you still see an error on loading, Hit 'F12' to bring up dev console and take a snapshot of the error and post it here.