Trouble with coding a clock in verilog -> Error (10170)

I everything inside the always @ totally different and it compiled without errors but it definitely didn't do what I wanted it to. It counted the seconds fine but everything else was whacky so I started over. Any tips or suggestions on how I can make the errors go away and I can compile this?

module clock(set,onehertz,hour,minute,ampmset,hr_ten,hr_one,min_ten,min_one,sec_ten,sec_one,am_pm); 
input onehertz,hour,minute,ampmset,set;		//SW0 to set, KEY3 for hours, KEY2 for Minutes, KEY1 for AM or PM
output  hr_ten,hr_one,min_ten,min_one,sec_ten,sec_one;
output  am_pm;
reg  hourtens,hourones,mintens,minones,sectens,secones;
reg  ampm;
always @ (posedge onehertz) begin
if (set == 0) begin
  secones <= secones+4'H1;
  if ( secones > 4'H9 && sectens < 4'H6 ) begin
	secones <= 4'H0;
	sectens <= sectens+4'H1;
  end else begin
    sectens <= 4'H0;
	minones <= minones+4'H1;
  end else if ( minones > 4'H9 && mintens < 4'H6 ) begin //Line 18, first error
	minones <= 4'H0;
	mintens <= mintens+4'H1;
  end else begin
    mintens <= 4'H0;
    hourones <= hourones+4'H1;
  end else if ( hourones > 4'H9 && hourtens == 4'H0 ) begin //Line 24, second error
	hourones <= 4'H0;
	hourtens <= hourtens+4'H1;
  end else if ( hourtens > 4'H1 && hourtens == 4'H2) begin
	hourtens <= 4'H0;
    if (ampm == 7'B0001100) begin
      ampm <= 7'B0001000;
    end else begin 
      ampm <= 7'B0001100;
    end
  end
end
if (set == 1) begin
  if (hour == 1) begin
  hourones <= hourones+4'H1;
  if ( hourones > 4'H9 && hourtens == 4'H0) begin
    hourones <= 4'H0;
    hourtens <= hourtens+4'H1;
  end else if ( hourtens == 4'H1 ) begin
    hourtens <= 4'H0;
  end
  end
  if (minute == 1) begin
  minones <= minones+4'H1;
  if ( minones > 4'H9 && mintens > 4'H5) begin
  	minones <= 4'H0;
    mintens <= mintens+1;
  end else if ( mintens > 4'H5 ) begin
	mintens <= 4'H0;
  end
  end
  if (ampmset == 1) begin
    if (ampm == 7'B0001100) begin
      ampm <= 7'B0001000;
    end else begin 
      ampm <= 7'B0001100;
    end
  end
end
end
assign hr_ten = {hourtens};
assign hr_one = {hourones};
assign min_ten = {mintens};
assign min_one = {minones};
assign sec_ten = {sectens};
assign sec_one = {secones};
assign am_pm = {ampm};
endmodule