Syntax error (ClassNotFoundException) compiling at (pyro/source.clj:1:1)

this is the only output I get after Pyro is enabled using `(printer/swap-stacktrace-engine!)`:

```
Syntax error (ClassNotFoundException) compiling at (pyro/source.clj:1:1).
javax.xml.bind.DatatypeConverter
```

On macOS, Java 11 (openjdk version "11.0.2"), Leiningen 2.9.1.