Error message gps and canbus

hello, trying som gps speed information sendt on canbus.
canbus int okay, , information form gps vel.
i'm new @ this, understand fault here? 

code: [select]


// can send example
//
#include <mcp_can.h>
#include <spi.h>
#include <tinygps++.h>
#include <softwareserial.h>

mcp_can can0(10);     // set cs pin 10

static const int rxpin = 4, txpin = 3;
static const uint32_t gpsbaud = 9600;

// tinygps++ object
tinygpsplus gps;

// serial connection gps device
softwareserial ss(rxpin, txpin);

byte spd (gps.speed.kmph);
void setup()
{
  serial.begin(115200);
  ss.begin(gpsbaud);

 
  serial.println(f("fullexample.ino"));
  serial.println(f("an extensive example of many interesting tinygps++ features"));
  serial.print(f("testing tinygps++ library v. ")); serial.println(tinygpsplus::libraryversion());
  serial.println(f("by mikal hart"));
  serial.println();
  serial.println(f("sats hdop latitude   longitude   fix  date       time     date alt    course speed card  distance course card  chars sentences checksum"));
  serial.println(f("          (deg)      (deg)       age                      age  (m)    --- gps ----  ---- london  ----  rx    rx        fail"));
  serial.println(f("---------------------------------------------------------------------------------------------------------------------------------------"));

  // initialize mcp2515 running @ 16mhz baudrate of 500kb/s , masks , filters disabled.
  if(can0.begin(mcp_any, can_500kbps, mcp_8mhz) == can_ok) serial.println("mcp2515 initialized successfully!");
  else serial.println("error initializing mcp2515...");

  can0.setmode(mcp_normal);   // change normal mode allow messages transmitted
}



void loop()
{
static const double london_lat = 51.508131, london_lon = -0.128002;

  printint(gps.satellites.value(), gps.satellites.isvalid(), 5);
  printint(gps.hdop.value(), gps.hdop.isvalid(), 5);
  printfloat(gps.location.lat(), gps.location.isvalid(), 11, 6);
  printfloat(gps.location.lng(), gps.location.isvalid(), 12, 6);
  printint(gps.location.age(), gps.location.isvalid(), 5);
  printdatetime(gps.date, gps.time);
  printfloat(gps.altitude.meters(), gps.altitude.isvalid(), 7, 2);
  printfloat(gps.course.deg(), gps.course.isvalid(), 7, 2);
  printfloat(gps.speed.kmph(), gps.speed.isvalid(), 6, 2);
  printstr(gps.course.isvalid() ? tinygpsplus::cardinal(gps.course.value()) : "*** ", 6);

  unsigned long distancekmtolondon =
    (unsigned long)tinygpsplus::distancebetween(
      gps.location.lat(),
      gps.location.lng(),
      london_lat,
      london_lon) / 1000;
  printint(distancekmtolondon, gps.location.isvalid(), 9);

  double coursetolondon =
    tinygpsplus::courseto(
      gps.location.lat(),
      gps.location.lng(),
      london_lat,
      london_lon);

  printfloat(coursetolondon, gps.location.isvalid(), 7, 2);

  const char *cardinaltolondon = tinygpsplus::cardinal(coursetolondon);

  printstr(gps.location.isvalid() ? cardinaltolondon : "*** ", 6);

  printint(gps.charsprocessed(), true, 6);
  printint(gps.sentenceswithfix(), true, 10);
  printint(gps.failedchecksum(), true, 9);
  serial.println();
 
  smartdelay(1000);

  if (millis() > 5000 && gps.charsprocessed() < 10)
    serial.println(f("no gps data received: check wiring"));
}

// custom version of delay() ensures gps object
// being "fed".
static void smartdelay(unsigned long ms)
{
  unsigned long start = millis();
 
  {
    while (ss.available())
      gps.encode(ss.read());
  } while (millis() - start < ms);
}

static void printfloat(float val, bool valid, int len, int prec)
{
  if (!valid)
  {
    while (len-- > 1)
      serial.print('*');
    serial.print(' ');
  }
  else
  {
    serial.print(val, prec);
    int vi = abs((int)val);
    int flen = prec + (val < 0.0 ? 2 : 1); // . , -
    flen += vi >= 1000 ? 4 : vi >= 100 ? 3 : vi >= 10 ? 2 : 1;
    (int i=flen; i<len; ++i)
      serial.print(' ');
  }
  smartdelay(0);
}

static void printint(unsigned long val, bool valid, int len)
{
  char sz[32] = "*****************";
  if (valid)
    sprintf(sz, "%ld", val);
  sz[len] = 0;
  (int i=strlen(sz); i<len; ++i)
    sz[i] = ' ';
  if (len > 0)
    sz[len-1] = ' ';
  serial.print(sz);
  smartdelay(0);
}

static void printdatetime(tinygpsdate &d, tinygpstime &t)
{
  if (!d.isvalid())
  {
    serial.print(f("********** "));
  }
  else
  {
    char sz[32];
    sprintf(sz, "%02d/%02d/%02d ", d.month(), d.day(), d.year());
    serial.print(sz);
  }
 
  if (!t.isvalid())
  {
    serial.print(f("******** "));
  }
  else
  {
    char sz[32];
    sprintf(sz, "%02d:%02d:%02d ", t.hour(), t.minute(), t.second());
    serial.print(sz);
  }

  printint(d.age(), d.isvalid(), 5);
  smartdelay(0);
}

static void printstr(const char *str, int len)
{
  int slen = strlen(str);
  (int i=0; i<len; ++i)
    serial.print(i<slen ? str[i] : ' ');
  smartdelay(0);

  byte data [8] = {0, 0, 0, 0, spd, 39, 0, 0};
 
  // send data:  id = 0x201, standard can frame, data length = 8 bytes, 'data' = array of data bytes send
  byte sndstat = can0.sendmsgbuf(0x201, 0, 8, data);
  if(sndstat == can_ok){
    serial.println("message sent successfully!");
  } else {
    serial.println("error sending message...");
  }
  delay(10);   // send data per 100ms


}

/*********************************************************************************************************
  end file
*********************************************************************************************************/


the error message is:
arduino: 1.6.11 (windows 8.1), board: "arduino/genuino uno"

can_send:19: error: cannot convert 'tinygpsspeed::kmph' type 'double (tinygpsspeed:()' type 'byte {aka unsigned char}'

 byte spd (gps.speed.kmph);

                         ^

exit status 1
cannot convert 'tinygpsspeed::kmph' type 'double (tinygpsspeed:()' type 'byte {aka unsigned char}'

this report have more information with
"show verbose output during compilation"
option enabled in file -> preferences.


thanks

quote

the error message is:
arduino: 1.6.11 (windows 8.1), board: "arduino/genuino uno"

can_send:19: error: cannot convert 'tinygpsspeed::kmph' type 'double (tinygpsspeed:()' type 'byte {aka unsigned char}'

 byte spd (gps.speed.kmph);

so, why trying to? can not fit size 13 foot in size 8 shoe.

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