The printer is displaying the message: File has an invalid extension! See the article for supported file extensions.
Error name: Invalid file extension
Error code: #10519
This error is shown when the extension of the model or calibration project is not recognized by the printer.
Make sure you have the latest version of PrusaSlicer. Then, reslice the model and try the print again.
Check valid extensions here: První tisk s PrusaSlicerem