Nikon Coolpix 300 - Manual (Page 109)

95 Troubleshooting : Error Codes
Error codes
If a problem occurs in the camera's internal circuits or memory, an error
code will appear in the main window of the touch-panel display.
ERROR = xxxx
To clear the display, turn the camera off and then on again. If the code is
still displayed when the camera is turned back on, contact your retailer or
Nikon representative for servicing.