This error comes from the .fbx files and the format is:

 ERROR: node has negative scale: prefix_yourobject(YOURTAGS) 

You need to go to your max file and search for that object, this error happens when you used a mirror tool that uses a "dirty" method of mirroring which is just use negative scales, if you use the mirror tool on the top bar in the default settings, you will most likely end up with this error

To solve error, you will need to reset xForm, and collapse to an editable mesh/poly

Never use the Mirror tool in the top bar, instead of it, use the Mirror Modifier on the "Modify" tab