Raise the flash, Turn the camera off and then on again, Speedlight setting error – Nikon COOLPIX P950 Digital Camera User Manual
Page 282: System error

282
Error messages
Raise the flash.
When shooting in [
Night portrait
] or [
Backlighting
] (with [
HDR
] set to [
Off
]) scene
mode, raise the built-in flash before shooting.
Turn the camera off and then on again.
An error occurred in lens operation.
Do not apply excessive force on the lens.
If you turn the camera off and then on again, lens operation will return to normal.
The camera is on but does not respond. (page 267)
If the error persists even after turning the camera off and then on again, contact your
retailer or Nikon-authorized service representative.
Speedlight setting error
A Speedlight function that cannot be used with the camera is set. Change the
Speedlight setting.
Speedlights (external flash units) (page 259)
System error
An error occurred in the camera’s internal circuitry. Turn the camera off, remove and
reinsert the battery, and turn the camera on.
The camera is on but does not respond. (page 267)
If the error persists, contact your retailer or Nikon-authorized service representative.
Clean HDMI output enabled. Select "Movie manual" mode.
When [
Clean HDMI output
] is set to [
On
] and the camera is connected to an HDMI-
compatible device, rotate the mode dial to Movie manual.