protocol error: 259 flows out of bounds

```go
file, err := os.Open("ft-v05.2017-03-22.014421+0300")
	p, err := netflow5.Read(bufio.NewReader(file))
	fmt.Println(err)

	for i, r := range p.Records {
		fmt.Println(i, r.DstAddr)
	}
```
**protocol error: 259 flows out of bounds**
Why do I get  this error?