Just want to add that the error is in the debug-view log when testing (attached previour post).
Input/Output to R looks normal in this file.

The traininig looks like might be incomplete from the screenshot attached, as the purple bar didn't go to the end,and 57 runs instead of 60, something might be happening during training, that actually causes the error when testing.

But there are no errors during training at all...

Attaching a screenshot, the debug-view training log (the previous one was for testing) and the train log again if can help