optuna-dashboard not working (optuna.exceptions.StorageInternalError), help?

[annikanni]

Hi,
I had run about 5 test studies and optuna-dashboard was working fine for us, but after running a longer XGBoost training (3-4 days) it has stopped working and gives the following error when trying to check the history (cmd optuna-dashboard with storage, host and port):

optuna.exceptions.StorageInternalError: An exception is raised during the commit. This typically happens due to invalid data in the commit, e.g. exceeding max length

The optuna-xgboost training finished without hickups, but now the storage is empty (every previous studies wiped out too). Do you know what is the problem and how to get optuna-dashboard working again? I can't start any "new" dashboards either.

(optuna 3.1.0 but updated to 3.1.1 did not solve it, optuna-dashboard 0.9.0)

Thanks,
Anni

[annikanni]

Oh sorry the directory where the sqlite file was saved changed and I did not notice it.