Texture Mapping Issues

So, I made a small model in Blockbench that's a little more complex than I thought. It's similar to the shape of rails. The export and import of both the model and the texture went smoothly, I exported it as a Java model. Whenever I try to edit the model with the texture however, it gives me a "This model does not support Texture Mapping" error. I've gone through all the different pages of issues on both this forum and Blockbench wiki with no luck. Does anyone know what might be the cause of it not being able to texture map?