Hi! Has anyone came across the issue when running

meltano invoke airflow scheduler/webserver

and get an error of

'StrictVersion' object has no attribute 'version'

? Thank you very much!

@happy-raincoat-87262 Is there any additional stacktrace you can share? Running in debug mode (

meltano --log-level=debug invoke ...

) will likely get more output to show up

Hi @ripe-musician-59933 thanks for your response, here is the log I got:

[2021-03-16 08:50:23,286] [68110|MainThread|meltano.cli.utils] [DEBUG] 'StrictVersion' object has no attribute 'version'
Traceback (most recent call last):
  File "/PATH/lib/python3.8/site-packages/meltano/cli/__init__.py", line 43, in main
    cli(obj={"project": None})
  File "/PATH/lib/python3.8/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/PATH/lib/python3.8/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/PATH/lib/python3.8/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/PATH/lib/python3.8/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/PATH/lib/python3.8/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/PATH/lib/python3.8/site-packages/meltano/cli/params.py", line 23, in decorate
    return func(*args, **kwargs)
  File "/PATH/lib/python3.8/site-packages/meltano/cli/params.py", line 57, in decorate
    func(project, *args, **kwargs)
  File "/PATH/lib/python3.8/site-packages/meltano/cli/invoke.py", line 45, in invoke
    with invoker.prepared(session):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", line 113, in __enter__
    return next(self.gen)
  File "/PATH/lib/python3.8/site-packages/meltano/core/plugin_invoker.py", line 129, in prepared
    self.prepare(session)
  File "/PATH/lib/python3.8/site-packages/meltano/core/plugin_invoker.py", line 113, in prepare
    with self.plugin.trigger_hooks("configure", self, session):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", line 113, in __enter__
    return next(self.gen)
  File "/PATH/lib/python3.8/site-packages/meltano/core/behavior/hookable.py", line 70, in trigger_hooks
    self.__class__.trigger(self, f"before_{hook_name}", *args, **kwargs)
  File "/PATH/lib/python3.8/site-packages/meltano/core/behavior/hookable.py", line 97, in trigger
    raise err
  File "/PATH/lib/python3.8/site-packages/meltano/core/behavior/hookable.py", line 89, in trigger
    hook_func(target, *args, **kwargs)
  File "/PATH/lib/python3.8/site-packages/meltano/core/plugin/airflow.py", line 92, in before_configure
    if StrictVersion(version) < StrictVersion("2.0.0")
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/distutils/version.py", line 52, in __lt__
    c = self._cmp(other)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/distutils/version.py", line 170, in _cmp
    if self.version != other.version:
AttributeError: 'StrictVersion' object has no attribute 'version'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/PATH/lib/python3.8/site-packages/meltano/cli/__init__.py", line 51, in main
    raise CliError(str(err)) from err
meltano.cli.utils.CliError: 'StrictVersion' object has no attribute 'version'

@happy-raincoat-87262 All right, that suggests that Meltano could not get a valid version from the call to

airflow version

here: https://gitlab.com/meltano/meltano/-/blob/master/src/meltano/core/plugin/airflow.py#L83. I'd like to see what

version

and

err

contain there. Are you comfortable editing the file at

/PATH/lib/python3.8/site-packages/meltano/core/plugin/airflow.py

to add some debug logging statements there, and then running again with

--log-level=debug

so we can see?

Hi! Thanks for your detailed instruction, it seems like we have some time difference here 😄 So this morning I did

meltano upgrade

and seems helping with the error.

@happy-raincoat-87262 All right! I wonder if airflow simply wasn't installed correctly. Is it all working now?

@ripe-musician-59933 I’m not sure. Actually everything was working all right the day before yesterday, that error was a sudden error which I never seen before. I don’t know what caused it. It seems all working now, thanks for your help!