Web Viewer error, json scene file does not specify a format

Discussion created by g_s_t_a_k_e_r on Jan 15, 2014
Latest reply on Jan 16, 2014 by AUlmer-esristaff

I've exported a number of ArcScene projects to .3ws using 10.2's Export to 3D Web Scene tool, then loaded to my company's internal web GIS solution (hosted by Portal for ArcGIS).

When attempting to launch the application, I get the attached error.

This error doesn't appear if I host the files externally (ArcGIS.com).

Any recommendations welcome.