an error happen "cannot run non-main package"

[sillygod]

hi, I recently found this package and try it with a code snippet and something wrong happens.

here is the screenshot.

[robrohan]

Emacs 26.1; golang 1.12.6; ob-go installed from melpa - with a simplified version of what you did it seems to work. I am not going to type your full code from your picture, is there possibly a bug with the go code itself?

[sillygod]

@robrohan I have not used this package for a long time and today I try it again. It works! However, I don't know why it failed before.