When init with exisiting instance, report permission error

[wangyjx]

execute cargo pgrx init --pg16=/etc/postgresql/16/main/postgresql.conf
environment:Ubuntu 24.04 in WSL
output

Validating /etc/postgresql/16/main/postgresql.conf
Error:
0: Permission denied (os error 13)

Location:
/root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/pgrx-pg-config-0.12.9/src/lib.rs:446

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SPANTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

0: cargo_pgrx::command::init::init_pgrx
at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/cargo-pgrx-0.12.9/src/command/init.rs:163
1: cargo_pgrx::command::init::execute
at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/cargo-pgrx-0.12.9/src/command/init.rs:88

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
⋮ 3 frames hidden ⋮
4: pgrx_pg_config::PgConfig::run::he0e8c2e0fc453420
at :
5: pgrx_pg_config::PgConfig::includedir_server::he5f2c222240c97db
at :
6: cargo_pgrx::command::init::init_pgrx::h61f98f7e6248cb06
at :
7: cargo_pgrx::main::h290723821aea2751
at :
8: std::sys::backtrace::__rust_begin_short_backtrace::h59e0e7e1a0d492dc
at :
9: std::rt::lang_start::{{closure}}::h76e69049fc1f26b3
at :
10: std::rt::lang_start_internal::h1c66660c99c8424c
at :
11: main
at :
12: __libc_start_main
at :
13: _start
at :

Did I do something wrong there?