Troubles compiling nauthz example gRPC code

[aidik]

The following error appears when trying to compile the nauthz gRPC example code:

aidik@vm:examples/nauthz ‹master*›$ cargo build --release                                      
  Downloaded tokio-util v0.7.4
  Downloaded axum v0.6.4
  Downloaded 2 crates (228.7 KB) in 0.38s
   Compiling proc-macro2 v1.0.51
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   Compiling socket2 v0.4.7
   Compiling num_cpus v1.15.0
   Compiling anyhow v1.0.69
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   Compiling either v1.8.1
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   Compiling tower-service v0.3.2
   Compiling rand_core v0.6.4
   Compiling http-body v0.4.5
   Compiling pin-project-internal v1.0.12
   Compiling futures-channel v0.3.26
   Compiling httparse v1.8.0
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   Compiling percent-encoding v2.2.0
   Compiling matchit v0.7.0
   Compiling async-stream v0.3.3
   Compiling hyper-timeout v0.4.1
   Compiling nauthz-server v0.1.0 (/home/aidik/nostr-rs-relay/examples/nauthz)
   Compiling tracing-futures v0.2.5
   Compiling tokio-stream v0.1.11
   Compiling base64 v0.13.1
   Compiling tonic v0.8.3
error[E0432]: unresolved import `nauthz_grpc::authorization_server`
 --> src/main.rs:3:18
  |
3 | use nauthz_grpc::authorization_server::{Authorization, AuthorizationServer};
  |                  ^^^^^^^^^^^^^^^^^^^^ could not find `authorization_server` in `nauthz_grpc`

For more information about this error, try `rustc --explain E0432`.
error: could not compile `nauthz-server` (bin "nauthz-server") due to previous error