What happened?

The printer is displaying the message: The project must have at least one layer.

Error name: Not enough layers

Error code: #10540 

This error happens when the project to be printed does not have enough layers to be printed.

How to fix it?

The project must have at least one layer. Open the project in PrusaSlicer and re-slice it to make surer that it is not corrupted. In case the project was manually edited, make sure to add more layers to it.