Thanks for your help. I fixed this and the model is now visible. However, the glass on the watch is not transparent. I had set it to alpha blend and I wonder if this could be the problem. The model renders fine in fast preview.

I had created a 3d model in Blender (without the Blend4Web project manager) and exported it as json with the Blend4Web Export option in Blender. Since I needed the Blend4Web web player for website integration, I created a new project in project manager and replace the json and the bin-files with the ones from my model. Unfortunately, the file is never displayed in the html iframe and I get the standard Blend4Web error message.

The model only contains geometry, textures and materials and some modifiers (no physics). Could the problem be caused by the bin file size (ca. 50mb) and is it legitimate to use the web player and corresponding assets in this way? A link to my test site is here: https://idealbild.se/produkter-3d.html

Any suggestions?