I had finished the board and then i had see the worked layers using the GC prevue tool for the errors occurred.
Then in that outline of board does not shown, then again checked with the brd file. The outline is visible in board geometry----> outline option.
The outline of my board is not get enabled during the artwork generation. Then any other option is been is to use it to add the outline of board.
The GC prevue tool layer is been shown below.
http://s16.postimg.org/lnfjxln2d/Error_Message_46.png
Check the above link for the error message.