Error while creating server in mac

Here is my code …

package main

import (
	"fmt"
	"log"
	"net/http"
)

func main() {
	fmt.Printf("Starting server at port 8080\n")

	if err := http.ListenAndServe(":8080", nil); err != nil {
		log.Fatal(err)
	}
}

Its showing error on the first line and when I try to run it, it gives following error…

# runtime/cgo
ld: warning: ld: warning: ignoring file /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/lib/libpthread.tbd, file was built for unsupported file format ( 0x2D 0x2D 0x2D 0x20 0x21 0x74 0x61 0x70 0x69 0x2D 0x74 0x62 0x64 0x2D 0x76 0x33 ) which is not the architecture being linked (x86_64): /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/lib/libpthread.tbd
ignoring file /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd, file was built for unsupported file format ( 0x2D 0x2D 0x2D 0x20 0x21 0x74 0x61 0x70 0x69 0x2D 0x74 0x62 0x64 0x2D 0x76 0x33 ) which is not the architecture being linked (x86_64): /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd
Undefined symbols for architecture x86_64:
  "___stack_chk_fail", referenced from:
      _x_cgo_init in _x004.o
      __cgo_sys_thread_start in _x004.o
  "___stack_chk_guard", referenced from:
      _x_cgo_init in _x004.o
      __cgo_sys_thread_start in _x004.o
  "___stderrp", referenced from:
      __cgo_sys_thread_start in _x004.o
      _x_cgo_sys_thread_create in _x005.o
      _x_cgo_thread_start in _x008.o
  "_abort", referenced from:
      __cgo_sys_thread_start in _x004.o
      _x_cgo_sys_thread_create in _x005.o
      _x_cgo_thread_start in _x008.o
  "_fprintf", referenced from:
      __cgo_sys_thread_start in _x004.o
      _x_cgo_sys_thread_create in _x005.o
  "_free", referenced from:
      _threadentry in _x004.o
  "_fwrite", referenced from:
      _x_cgo_thread_start in _x008.o
  "_malloc", referenced from:
      _x_cgo_thread_start in _x008.o
  "_nanosleep", referenced from:
      _x_cgo_sys_thread_create in _x005.o
      __cgo_try_pthread_create in _x005.o
  "_pthread_attr_destroy", referenced from:
      _x_cgo_init in _x004.o
  "_pthread_attr_getstacksize", referenced from:
      _x_cgo_init in _x004.o
      __cgo_sys_thread_start in _x004.o
  "_pthread_attr_init", referenced from:
      _x_cgo_init in _x004.o
      __cgo_sys_thread_start in _x004.o
  "_pthread_cond_broadcast", referenced from:
      _x_cgo_notify_runtime_init_done in _x005.o
  "_pthread_cond_wait", referenced from:
      __cgo_wait_runtime_init_done in _x005.o
  "_pthread_create", referenced from:
      _x_cgo_sys_thread_create in _x005.o
      __cgo_try_pthread_create in _x005.o
     (maybe you meant: __cgo_try_pthread_create)
  "_pthread_detach", referenced from:
      _x_cgo_sys_thread_create in _x005.o
      __cgo_try_pthread_create in _x005.o
  "_pthread_mutex_lock", referenced from:
      __cgo_wait_runtime_init_done in _x005.o
      _x_cgo_notify_runtime_init_done in _x005.o
      _x_cgo_set_context_function in _x005.o
      __cgo_get_context_function in _x005.o
  "_pthread_mutex_unlock", referenced from:
      __cgo_wait_runtime_init_done in _x005.o
      _x_cgo_notify_runtime_init_done in _x005.o
      _x_cgo_set_context_function in _x005.o
      __cgo_get_context_function in _x005.o
  "_pthread_sigmask", referenced from:
      __cgo_sys_thread_start in _x004.o
  "_setenv", referenced from:
      _x_cgo_setenv in _x006.o
     (maybe you meant: _x_cgo_setenv)
  "_strerror", referenced from:
      __cgo_sys_thread_start in _x004.o
      _x_cgo_sys_thread_create in _x005.o
  "_unsetenv", referenced from:
      _x_cgo_unsetenv in _x006.o
     (maybe you meant: _x_cgo_unsetenv)
ld: symbol(s) not found for architecture x86_64
clang-4.0: error: linker command failed with exit code 1 (use -v to see invocation)

Please tell me what should i do…thanx in advance…

How do you run it? is it just go run main.go or something else