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```with Flow("STL Flow") as f:
    files = Parameter("files")

f.run(files='fname.txt')```


Hey <@U013XTS1ZT8>,
Happy to help here. Do you mind putting the error message in this thread below? We want to provide visibility to other inquiries above.

This thread. I'll paste your traceback below to free up some space on the main page:

```$ python3 -m vtk_flow.flow
/home/macmenaminpe/.local/lib/python3.8/site-packages/prefect/core/flow.py:349: UserWarning: Tasks were created but not added to the flow: {&lt;Parameter: files&gt;}. This can occur when `Task` classes, including `Parameters`, are instantiated inside a `with flow:` block but not added to the flow either explicitly or as the input to another task. For more information, see <https://docs.prefect.io/core/advanced_tutorials/task-guide.html#adding-tasks-to-flows>.
  warnings.warn(
Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/home/macmenaminpe/code/nih-3d-resource-workflows/vtk_flow/flow.py", line 71, in &lt;module&gt;
    f.run(files='Cube_3d_printing_sample.stl')
  File "/home/macmenaminpe/.local/lib/python3.8/site-packages/prefect/core/flow.py", line 1213, in run
    state = self._run(
  File "/home/macmenaminpe/.local/lib/python3.8/site-packages/prefect/core/flow.py", line 1032, in _run
    flow_state = runner.run(
TypeError: run() got an unexpected keyword argument 'files'```

ok - sorry, thought the snippet plus err was more helpful as a single message.

Yeah np, definitely helpful - just don't want to lose other inquiries from today.

Based on your snippet, I think you're trying to accomplish something like this(?):
```with Flow("STL Flow") as f:
    files = Parameter(name="files", default='fname.txt')

f.run(parameters={'files': 'some_other_file.txt'})```

This would set the default of your Parameter to a certain value, which can be changed at runtime by setting the Parameter in `f.run()`

ok - so I'm using `prefect/examples/parameterized_flow.py` as a template.

I've seen this error before, - and it seemingly worked for me. Then the above happens with the unexpected keyword, and I don't understnad where that error comes from

Ah gotcha, looks like the Parameter is not binding to the flow because it is not being used as input for another Task

Yep, so using the <https://docs.prefect.io/core/examples/parameterized_flow.html#parameterized-conditions|parameterized_flow.py example>, the Parameter Task `value` is being taken in as an argument for `check_if_even`, `print_odd`, and `print_even` in the flow context as runtime values. These parameter values can be changed in the `flow.run()` arguments (which is what I thought you were getting at with your initial snippet), but still need to be passed to other tasks.

Yes - right. I think I get the logic. I just didn't understand that error message, I thought I'd put a typo in somewhere. Thanks Kyle!