Error

The model is still loading

The engine is reading the model into memory and cannot answer yet.

What it means

A model has to be read from disk into memory before it can answer, and a large one takes a while. Until that finishes, the engine answers that it is loading. Nothing is wrong.

What to do

Still stuck

Settings → Data → Open log folder has the logs, and app.log is safe to share. Open an issue with the message you saw and that log, or read Troubleshooting.