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extern crate reqwest;

fn main() 
 let client = reqwest::Client::new();

When I run this I get this error.

thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', libcore/option.rs:345:21

I also tried it with the builder but the error remains same.

extern crate reqwest;

fn main() 
 let mut client = reqwest::Client::builder(); // Panics here 
 match client.build() 
 Err(e) => println!(":?", e);
 _ => 
 

Here the full stack backtrace of this code.

 thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', libcore/option.rs:345:21
 stack backtrace:
 0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
 at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
 1: std::sys_common::backtrace::print
 at libstd/sys_common/backtrace.rs:71
 at libstd/sys_common/backtrace.rs:59
 2: std::panicking::default_hook::closure
 at libstd/panicking.rs:211
 3: std::panicking::default_hook
 at libstd/panicking.rs:227
 4: std::panicking::rust_panic_with_hook
 at libstd/panicking.rs:511
 5: std::panicking::continue_panic_fmt
 at libstd/panicking.rs:426
 6: rust_begin_unwind
 at libstd/panicking.rs:337
 7: core::panicking::panic_fmt
 at libcore/panicking.rs:92
 8: core::panicking::panic
 at libcore/panicking.rs:53
 9: <core::option::Option<T>>::unwrap
 at /checkout/src/libcore/macros.rs:20
 10: openssl::ssl::SslContextBuilder::set_options
 at /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.9.24/src/ssl/mod.rs:905
 11: openssl::ssl::connector::ctx
 at /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.9.24/src/ssl/connector.rs:42
 12: openssl::ssl::connector::SslConnectorBuilder::new
 at /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.9.24/src/ssl/connector.rs:67
 13: native_tls::imp::TlsConnector::builder
 at /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/native-tls-0.1.5/src/imp/openssl.rs:186
 14: native_tls::TlsConnector::builder
 at /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/native-tls-0.1.5/src/lib.rs:390
 15: reqwest::async_impl::client::ClientBuilder::new
 at /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/reqwest-0.8.6/src/async_impl/client.rs:79
 16: reqwest::client::ClientBuilder::new
 at /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/reqwest-0.8.6/src/client.rs:63
 17: reqwest::client::Client::builder
 at /home/ubuntu/.cargo/registry/src/github.com-1ecc6299db9ec823/reqwest-0.8.6/src/client.rs:281
 18: project::proj::tp_app::uploader::start
 at src/proj/tp_app/uploader.rs:4

Quoting the documentation of reqwest::Client::new

This method panics if native TLS backend cannot be created or initialized. Use Client::builder() if you wish to handle the failure as an Error instead of panicking.