undefined issue

[jkwebster]

Hi,what other lib should I import to resolve following issue?
../../go/src/github.com/izqui/blockchain/core/main.go:17: undefined: OpenConfiguration
../../go/src/github.com/izqui/blockchain/core/main.go:17: undefined: HOME_DIRECTORY_CONFIG
../../go/src/github.com/izqui/blockchain/core/main.go:22: undefined: WriteConfiguration
../../go/src/github.com/izqui/blockchain/core/main.go:22: undefined: HOME_DIRECTORY_CONFIG

[ljbhl]

I have the same error