Undefined keys in Herumi during build

[eric-official]

Hi,
I currently want to run the builder playground for the first time. When I execute the command go run main.go, I receive the following errors:

go: downloading github.com/herumi/bls-eth-go-binary v0.0.0-20210917013441-d37c07cfda4e
github.com/herumi/bls-eth-go-binary/bls
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:9:28: undefined: SecretKey
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:9:40: undefined: Fr
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:13:26: undefined: Fr
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:13:31: undefined: SecretKey
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:19:28: undefined: PublicKey
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:19:40: undefined: G1
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:23:26: undefined: G1
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:23:31: undefined: PublicKey
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:29:23: undefined: Sign
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:29:30: undefined: G2
../../go/pkg/mod/github.com/herumi/[email protected]/bls/cast.go:29:30: too many errors
github.com/supranational/blst/bindings/go
../../go/pkg/mod/github.com/supranational/[email protected]/bindings/go/rb_tree.go:130:18: undefined: Message

To solve the error, I tried to clone the builder playground again, reinstall Go, and install Herumi in a different version. However, no action could resolve this error. Do I need to configure any key before I execute the go run main.go command? Any help would be appreciated.