import path does not begin with hostname

[hsluoyz]

C:\Users\Administrator>go get -v github.com/Jolly23/GRE3000
github.com/Jolly23/GRE3000 (download)
package GRE3000/base/cache: unrecognized import path "GRE3000/base/cache" (import path does not begin with hostname)
package GRE3000/const_conf: unrecognized import path "GRE3000/const_conf" (import path does not begin with hostname)
package GRE3000/models: unrecognized import path "GRE3000/models" (import path does not begin with hostname)
package GRE3000/routers: unrecognized import path "GRE3000/routers" (import path does not begin with hostname)
package GRE3000/templates: unrecognized import path "GRE3000/templates" (import path does not begin with hostname)
package GRE3000/utils: unrecognized import path "GRE3000/utils" (import path does not begin with hostname)