feat: add error message when experiment is None (#708)

* feat: add error message when experiment is * chore: update changelog * chore: correct grammar * chore: adjust error message
jina-ai · Apr 5, 2023 · 3fb9658 · 3fb9658
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add support for python 3.10. ([#704](https://github.com/jina-ai/finetuner/pull/704))
 
+- Add error message when `experiment` is `None` when creating a run. ([#708](https://github.com/jina-ai/finetuner/pull/708))
+
 ### Removed
 
 ### Changed

diff --git a/finetuner/finetuner.py b/finetuner/finetuner.py
@@ -185,6 +185,13 @@ def create_run(
             experiment = self._default_experiment
         else:
             experiment = self.get_experiment(name=experiment_name)
+        if not experiment:
+            raise ValueError(
+                (
+                    'Unable to start finetuning run as experiment is `None`. '
+                    'Make sure you have logged in using `finetuner.login(force=True)`.'
+                )
+            )
         return experiment.create_run(
             model=model,
             train_data=train_data,