Output Grayscale Image through VGA in DE1

I tired to edit the DE1_D5M code given by altera. From there, I wanted to convert the RGB image to grayscale from a separate module and then output it to VGA.

assign DISP_R = SW ? GrayscaleR  : VGA_out_R;
assign DISP_G = SW ? GrayscaleG  : VGA_out_G;
assign DISP_B = SW ? GrayscaleB  : VGA_out_B;                                
// RGB
assign  VGA_out_R  = Read_DATA2;
assign  VGA_out_G  = {Read_DATA1,Read_DATA2};
assign  VGA_out_B  = Read_DATA1;
// Gray
assign  GrayscaleR  = VGA_out_G;
assign  GrayscaleG  = VGA_out_G;
assign  GrayscaleB  = VGA_out_G;
assign    VGA_CTRL_CLK=    rClk;
assign    VGA_CLK        =    ~rClk;
always@(posedge CLOCK_50)    rClk    <=    rClk+1;
wire        oVGA_R;
wire        oVGA_G;
wire        oVGA_B;
assign    VGA_R        =    oVGA_R;
assign    VGA_G        =    oVGA_G;
assign    VGA_B        =    oVGA_B;
always@(posedge CCD_PIXCLK)
begin
    rCCD_DATA    <=    CCD_DATA;
    rCCD_LVAL    <=    CCD_LVAL;
    rCCD_FVAL    <=    CCD_FVAL;
end
VGA_Controller        u1    (    //    Host Side
                            .oRequest(Read),
                            .iRed(DISP_R),
                            .iGreen(DISP_G,
                            .iBlue(DISP_B),
                            //    VGA Side
                            .oVGA_R(VGA_R),
                            .oVGA_G(VGA_G),
                            .oVGA_B(VGA_B),
                            .oVGA_H_SYNC(VGA_HS),
                            .oVGA_V_SYNC(VGA_VS),
                            //    Control Signal
                            .iCLK(VGA_CTRL_CLK),
                            .iRST_N(DLY_RST_2)
                       &nbsp;);