AdaptiveThreshold, FindContours runtime error

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Runtime Error

Hi, I just build opencv 4.0.1 then i tried to compile the program, and it's success but when the application run AdaptiveThreshold, FindContours it got runtime error. I wonder is there any mistake?

This is the sample code

package main
import (
    "fmt"
    _ "image"
    cv2 "gocv.io/x/gocv"
)
func main() {
    path := "yuuki_tatsuya_b.jpg"
    window := cv2.NewWindow("testing")
    img := cv2.IMRead(path, cv2.IMReadColor)
    if img.Empty() {
        fmt.Println("cant read image")
        fmt.Println("end.")
        return
    }
    imgray := cv2.NewMat()
    cv2.CvtColor(img, &imgray, cv2.ColorBGRToGray)
    //th1 := cv2.NewMat() // got error
    //cv2.AdaptiveThreshold(img, &th1, 255.0, cv2.AdaptiveThresholdGaussian, cv2.ThresholdBinary, 1023, 0.0)
    th2 := cv2.NewMat()
    cv2.Threshold(img, &th2, 8.0, 255.0, cv2.ThresholdBinary)

    contours := cv2.FindContours(img, cv2.RetrievalExternal, cv2.ChainApproxSimple) // got error too
    fmt.Printf("%+v\n", contours)

    cv2.IMWrite("testing.jpg", imgray)
    cv2.IMWrite("testing2.jpg", th2)

    for { 
        window.IMShow(img)
        if window.WaitKey(1) >= 0 {
            break
        }
    }
}

And got error:

• Operating System and version: Windows 10
• OpenCV version used: 4.0.1
• How did you install OpenCV? Build from source
• GoCV version used: 0.19.0
• Go version: go1.11.2 windows/amd64
• Did you run the env.sh or env.cmd script before trying to go run or go build? no, because the content ECHO This script is no longer necessary and has been deprecated.

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Closing due to age, please reopen if needed. Thank you.