The dojang from kev0960

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Something incorrect to my dojang implementation. After adding it, the app panicks!

Hello kev0960, I like that this repo exists, but my knowledge lacks and could not implement it correctly.
Here the code i added:

println!("1111111111111111");
  let mut dj = Dojang::new();
  println!("22222222222222222222");

  // Load files as template under /template/files/path.
  dj.load("src/emails").unwrap();
  println!("333333333333333");

  // dj.add("src/emails/order_email.ejs".to_string()).unwrap();
  dj.render("order_email.ejs", serde_json::json!({"data" : email_order})).unwrap();
  println!("4444444444444444444");

  let order_email_content = fs::read_to_string(&"src/emails/order_email.ejs")?;

This prints this:

1111111111111111
22222222222222222222
thread 'actix-rt|system:0|arbiter:0' panicked at 'Cannot add op to End; op ParenClose', /home/klala/.cargo/registry/src/github.com-1ecc6299db9ec823/dojang-0.1.6/src/expr.rs:86:18

The Error originates to dojang, but no idea why?
The Error is not clear.

Notes: After adding dojang this error is there, my suspicion is a have made a mistake on how to use dojang.
Another Question: How could i use the template as a string after using dojang, there is no documentation clear to this.
Thanks, i am newbie to Rust.