NoneType' object has no attribute 'replace

[meng25meng]

Hello, your tutorial, the last error when running to the last step is as follows：

AttributeError                            Traceback (most recent call last)
Cell In[39], line 1
----> 1 scenario.solve()

File D:\Anaconda3\envs\message_env\Lib\site-packages\message_ix\core.py:675, in Scenario.solve(self, model, solve_options, **kwargs)
    656 def solve(self, model="MESSAGE", solve_options={}, **kwargs):
    657     """Solve MESSAGE or MESSAGE-MACRO for the Scenario.
    658 
    659     By default, :meth:`ixmp.Scenario.solve` is called with 'MESSAGE' as the
   (...)
    673         :class:`.MESSAGE_MACRO` class and :class:`.GAMSModel`.
    674     """
--> 675     super().solve(model=model, solve_options=solve_options, **kwargs)

File D:\Anaconda3\envs\message_env\Lib\site-packages\ixmp\core\scenario.py:878, in Scenario.solve(self, model, callback, cb_kwargs, **model_options)
    876 # Iterate until convergence
    877 while True:
--> 878     model_obj.run(self)
    880     # Store an iteration number to help the callback
    881     if not hasattr(self, "iteration"):

File D:\Anaconda3\envs\message_env\Lib\site-packages\message_ix\models.py:219, in GAMSModel.run(self, scenario)
    216 lines2 = ("{} = {}".format(*kv) for kv in self.cplex_opts.items())
    217 optfile2.write_text("\n".join(lines2))
--> 219 result = super().run(scenario)
    221 # In previous versions, the `cplex.opt` file(s) were removed at this point
    222 # in the workflow. This has been removed due to issues when running
    223 # scenarios asynchronously.
    225 return result

File D:\Anaconda3\envs\message_env\Lib\site-packages\ixmp\model\gams.py:305, in GAMSModel.run(self, scenario)
    302 self.scenario = scenario
    304 # Record versions of packages listed in `record_version_packages`
--> 305 self.record_versions()
    307 # Format or retrieve the model file option
    308 model_file = Path(self.format_option("model_file"))

File D:\Anaconda3\envs\message_env\Lib\site-packages\ixmp\model\gams.py:266, in GAMSModel.record_versions(self)
    263 for package in self.record_version_packages:
    264     try:
    265         # Retrieve the version; replace characters not supported by GAMS
--> 266         package_version = version(package).replace(".", "-")
    267     except PackageNotFoundError:
    268         package_version = "(not installed)"  # Not installed

AttributeError: 'NoneType' object has no attribute 'replace'

[glatterf42]

Hi @meng25meng, thanks for reporting this issue!
Could you please run message-ix show-versions in your message_env virtual environment and share the output here? Because it looks like the code cannot find a package it needs on your system.
Also, please specify which tutorial you are trying to run and whether you made any changes to it.

[glatterf42]

From a quick search online, it doesn't look like version(package) should ever be None. There were bugs in the past where deleting e.g. /path/to/site-package/message_ix-3.8.0.dist-info/* would cause this, but I don't suspect you've done that?

[meng25meng]

Hi @meng25meng, thanks for reporting this issue! Could you please run message-ix show-versions in your message_env virtual environment and share the output here? Because it looks like the code cannot find a package it needs on your system. Also, please specify which tutorial you are trying to run and whether you made any changes to it.

thankyou,asfollows:

(message_env) PS C:\Users\Administrator> message-ix show-versions
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "D:\Anaconda3\envs\message_env\Scripts\message-ix.exe\__main__.py", line 7, in <module>
  File "D:\Anaconda3\envs\message_env\Lib\site-packages\click\core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Anaconda3\envs\message_env\Lib\site-packages\click\core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "D:\Anaconda3\envs\message_env\Lib\site-packages\click\core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Anaconda3\envs\message_env\Lib\site-packages\click\core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Anaconda3\envs\message_env\Lib\site-packages\click\core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Anaconda3\envs\message_env\Lib\site-packages\ixmp\cli.py", line 111, in show_versions_cmd
    ixmp.show_versions()
  File "D:\Anaconda3\envs\message_env\Lib\site-packages\ixmp\util\__init__.py", line 627, in show_versions
    info.append((module_name, version + gl))
                              ~~~~~~~~^~~~
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

[meng25meng]

From a quick search online, it doesn't look like version(package) should ever be None. There were bugs in the past where deleting e.g. /path/to/site-package/message_ix-3.8.0.dist-info/* would cause this, but I don't suspect you've done that?

我的虚拟环境里确实有您提到的这个版本，不知道是不是这个原因，刚开始安装有点不太熟悉。在虚拟环境里的如下：

[guofei2016]

Just translate the Chinese from @meng25meng here:
"I do have the version you mentioned in my virtual environment. I don’t know if this is the reason. I was a little unfamiliar with the installation at first. In the virtual environment, it is as follows:"

[glatterf42]

Okay, so message-ix show-versions should be working inside your environment. From your screenshot, I think the error might originate from the message_ix-0.0.0.dist-info folder being present. For comparison, the only two folder with respect to ixmp and message_ix in my site-packages are:

ixmp-3.8.1.dev9+g9b93531.dist-info
message_ix-3.8.1.dev4+g4dae41e.dist-info

You don't have to worry about the .1.dev... part, this just comes from my specific mode of installation. I'm wondering: what happens if you manually deleted the message_ix-0.0.0.dist-info folder and the same for ixmp, if it exists?
I don't quite know how they got there, maybe something went wrong during installation, but they shouldn't be here either way.

[meng25meng]

感谢您的建议，我把message_ix-0.0.0.的相关包删除了，现在可以正常运行，非常感谢！

Okay, so message-ix show-versions should be working inside your environment. From your screenshot, I think the error might originate from the message_ix-0.0.0.dist-info folder being present. For comparison, the only two folder with respect to ixmp and message_ix in my site-packages are:

ixmp-3.8.1.dev9+g9b93531.dist-info
message_ix-3.8.1.dev4+g4dae41e.dist-info

You don't have to worry about the .1.dev... part, this just comes from my specific mode of installation. I'm wondering: what happens if you manually deleted the message_ix-0.0.0.dist-info folder and the same for ixmp, if it exists? I don't quite know how they got there, maybe something went wrong during installation, but they shouldn't be here either way.

Thanks for your advice, I have deleted the related package of message_ix-0.0.0. now it can run normally, thank you very much!

[glatterf42]

Glad this solved the problem :)