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 the problem still persists, please contact support by raising a support request above.