Build error: unable to run examples

[RedaBenh]

I tried to follow the readme instruction but i get this error:

ERROR 22:05:10 revel.go:98: Unable to determine import path from :

redabenh@macbook-pro-1 testrevel % revel run github.com/revel/examples/booking
ERROR 22:05:10   revel.go:98: Unable to determine import path from :   
Usage:
  revel [OPTIONS] run [run-OPTIONS]

Application Options:
  -v, --debug                 If set the logger is set to verbose
      --historic-run-mode     If set the runmode is passed a string not json
      --historic-build-mode   If set the code is scanned using the original parsers, not the go.1.11+
  -X, --build-flags=          These flags will be used when building the application. May be specified multiple times, only applicable for Build, Run, Package, Test
                              commands
      --gomod-flags=          These flags will execute go mod commands for each flag, this happens during the build process

Help Options:
  -h, --help                  Show this help message

[run command options]
      -a, --application-path= Path to application folder
      -m, --run-mode=         The mode to run the application in
      -p, --port=             The port to listen (default: -1)
      -n, --no-proxy          True if proxy server should not be started. This will only update the main and routes files on change

I miss something ?