golang下載包出現錯誤：unrecognized import path

go get -u -t github.com/volatiletech/sqlboiler

package golang.org/x/sys/unix: unrecognized import path "golang.org/x/sys/unix" (https fetch: Get https://golang.org/x/sys/unix?go-get=1: proxyconnect tcp: net/http: TLS handshake timeout)
package golang.org/x/text/transform: unrecognized import path "golang.org/x/text/transform" (https fetch: Get https://golang.org/x/text/transform?go-get=1: proxyconnect tcp: net/http: TLS handshake timeout)
package golang.org/x/text/unicode/norm: unrecognized import path "golang.org/x/text/unicode/norm" (https fetch: Get https://golang.org/x/text/unicode/norm?go-get=1: proxyconnect tcp: net/http: TLS handshake timeout)