col not declared issue{Verilog}

Question

I am having a problem here can't make this code compile. It is a 4x4 keypad scanner with a 20ms debouncer. It gives error "Error: 'col' has not been declared" Any suggestion?

module keyboardScanner (input clk, input wait20, ,input [3:0] col,output reg [3:0] row, output reg [7:0] keyCode);
reg [1:0]state=2'b00;
reg [1:0]nextState=2'b00;
reg start = 0;
//state register
always@(posedge clk) begin
 state <= nextState;
end
//output CL
always@(posedge clk) begin
 if(start == 0)begin
 case (state)
 2'b00: row <= 4'b0001;
 2'b01: row <= 4'b0010;
 2'b10: row <= 4'b0100;
 2'b11: row <= 4'b1000;
 default: row <= 4'b0001;
 endcase
 end
 if (col != 4'b0000)
 start = 1;
 if ((col != 4'b0000) && (wait20 == 1) && (start == 0)) begin
 keyCode <= {row[1],row[2],row[3],row[0], col[0],col[1],col[2],col[3]};
 start = 0;
 end
end
//next state CL
always @(posedge clk) begin
 if(start == 0)begin
 case (state)
 2'b00: nextState <= 2'b01;
 2'b01: nextState <= 2'b10;
 2'b10: nextState <= 2'b11;
 2'b11: nextState <= 2'b00;
 default: nextState <= 2'b00;
 endcase
 end
end
endmodule

• Tom Carpenter: You have an extra comma (,) in your module declaration just before where the col input is declared. If you wrote it out neatly with each input/output on its own line rather than mushing everything up into one line, this would be obvious. Neat code = easy debug.
• anon: Thank you very much. I am really tired of designing FSMs and coding. Thanks a lot. It helped me! :D
• Paebbels: Possible duplicate of 4x4 keyboard matrix not generating unique keycodes
• Paebbels: As in your last question: what device/keypad do you use? My research shows that you must swap the pin directions of columns and rows.
• anon: @Paebbels I am using basys2 fpga. Why should I do that? It's the same thing.