This error appears on your Ultimaker S5 / Ultimaker S3 when the printer settings in the GCODE do not match with the printer. Please go to Ultimaker Cura and make sure you have selected the correct printer type.
This error can also appear when using software other than Ultimaker Cura to prepare prints. The printer checks the GCODE header to match the information with the firmware. If the print preparation software does not use a compatible header, the Ultimaker S5 will view the GCODE as incompatible.
If you require further support, please contact us by submitting a ticket.
Please ensure to include the error number (ERXX) and your printer's log files.