Thanks for reaching out Mani. A few questions:
1) When you first load up WIT with your data and model, does it make an initial prediction for each datapoint? That is, if you click on a datapoint, do you see any results in the inference results panel in the bottom left? Or do you see that attribute error in the top-right status bar during start-up as well?
2) Are you able to share a jupyter or colab notebook that reproduces the problem? I'd like to look at your custom prediction function and the format of the data you provide to WIT.
-James