Errors with showman execute

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I am trying to use showman to execute a python script:

/home/x/myenv/bin/showman execute x.typ 

but getting the following errors:

Traceback (most recent call last):
  File "/home/x/myenv/bin/showman", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/x/myenv/lib64/python3.12/site-packages/showman/__main__.py", line 21, in main
    return fire.Fire(
           ^^^^^^^^^^
  File "/home/x/myenv/lib64/python3.12/site-packages/fire/core.py", line 143, in Fire
    component_trace = _Fire(component, args, parsed_flag_args, context, name)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/x/myenv/lib64/python3.12/site-packages/fire/core.py", line 477, in _Fire
    component, remaining_args = _CallAndUpdateTrace(
                                ^^^^^^^^^^^^^^^^^^^^
  File "/home/x/myenv/lib64/python3.12/site-packages/fire/core.py", line 693, in _CallAndUpdateTrace
    component = fn(*varargs, **kwargs)
                ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/x/myenv/lib64/python3.12/site-packages/showman/executer.py", line 341, in execute
    runner = CodeRunner(root_dir or os.getcwd(), config=config)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/x/myenv/lib64/python3.12/site-packages/showman/executer.py", line 202, in __init__
    self.workspace_cache = json.load(f)
                           ^^^^^^^^^^^^
  File "/usr/lib64/python3.12/json/__init__.py", line 293, in load
    return loads(fp.read(),
           ^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

The document x.typ is:

#import "@preview/showman:0.1.1": runner, formatter
#set page(height: auto)

#show raw: it => {
  let kwargs = if it.block {
    (width: 100%, line-numbers: false)
  } else {
    (inline: true)
  }
  formatter.format-raw(it, ..kwargs)

}

#show <example-output>: formatter.format-raw
// #show <example-input>: formatter.format-raw

#let cache = json("/.coderunner.json").at("/x.typ", default: (:))
#let show-rule = runner.external-code.with(
  result-cache: cache,
  direction: ttb,
)

#show raw: it => {
  if it.at("label", default: none) != <continue> {
    heading(it.lang)
  }
  if it.lang != "typst" {
    show-rule(it)
  } else {
    runner.standalone-example(it, direction: ttb)
  }
}


```python
import functools

@functools.lru_cache(maxsize=None)
def fib(n):
    if n < 2:
        return n
    return fib(n-1) + fib(n-2)

fib(50)
```