Advanced Prediction error at step "Save Predictions to Cube"

Summary:

My AP job runs into the following error:

Loading predictions to Planning failed.: Unable to load the following resource: Unable to perform clear operation before loading the predictions.

Content (please ensure you mask any confidential information):

This is what I get:

I've put together the simplest of setups to start testing this. All elements are Lvl0 and Never Share, from each dimension there is only one member selected, except for the scenario dimension, the POVs are all the same. There's data in all prior and future periods etc.

Here's the config:

Any ideas why this is not working?

Thanks!