In my experience it usually means the board you are currently viewing is not up to date (most likely your opponent made a move or resigned etc.). The game board should update itself after the error has been displayed.
Oops. . .
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Would, please, any Admin, explain me why the following note appears so often when I am playing "online" chess, unrated games ?
<>" Oops! Please try making your move again.It appears your board was not current.<>
It appears without making reference as to what game it refers. . .the one on the display or the previous. . .(Oops!. . .It is becoing sort of tedious).