I was following wildrender's first tutorial on how to make a halo ce map, when he got to the part with Bluestreak's JMS exporter, he saved the file and everything worked for him. But for me, when I clicked the export jms data buttton, it gave me the error:

Unknown propetry: "name" in undefined

The version of my JMS exporter is 1.0.2 (but I have tried with 1.0.1)

those bluestreak exporters require a few things when exporting map terrain

The level geometry should be linked to an object called frame. Frame doesn't need a material and it doesn't have to be an editable object. Can see if its linked from the scene-explorer(if you're using a newer 3dsmax that has the scene explorer)

The level geometry needs a 'Multi/Sub-Object' material applied to it, halo won't like it if it's using a 'Standard' material

The level is parented/linked to an object called frame. It also has a multi material attached. Still the same error.

Sorry for the late reply, but to everyone who is dealing with this same error, "name" in undefined means that there are parts of the model that are using incorrect material IDs (material IDs that are not in the multimaterial). The best way to deal with this is to go through each face of the model and check its material ID. If its ID is a number not found in the mutlimaterial (for example, if you have four materials, which are IDs of 1, 2, 3, and 4, in your multimaterial and the face's material ID is 5, it is incorrect) change it to its correct ID. As long as the model uses the correct material IDs, it should export.

I hope this helps some people out!