为什么总是这个错误？

package main

import (
    "flag"
    "fmt"
)

var infile *string = flag.String("i", "infile", "File contains values for sorting")
var outfile *string = flag.String("o", "outfile", "File to receive sorted values")
var algorithm *string = flag.String("a", "qsort", "Sort algorithm")

func main() {
    flag.Parse()
    if infile != nil {
        fmt.Println("infile = ", *infile, "outfile =", *outfile, "algorithm =", *algorithm)
    }
}

[ go run | done: ]

Failed to construct ipc body: Encode Error: 'utf8' codec can't decode bytes in position 14-15: invalid data

我刚开始学，还不懂