OSError: Cache file does not exists. in Notebook

[aki_h]

Hello.

In Microsoft Fabric's Notebook, the following error occurred when running pyspark.
It was running fine a few minutes before the error occurred.

My colleague is in the same situation, and there is no configuration change or other event that I am aware of.

I would appreciate any information if anyone else has a similar phenomenon or knows of a solution or fault information.

Thanks for taking a look at the post.

import sempy.fabric as fabric
from pyspark.sql import functions as F
from pyspark.sql.types import StructType, StructField, StringType, IntegerType, DateType, DecimalType

## ---error message
Cache file does not exists. resource=$ml, path=$/nfs4/tridenttokenlibrary/tokens/ml.token
failed to get ml token
Traceback (most recent call last):
  File "/home/trusted-service-user/cluster-env/trident_env/lib/python3.11/site-packages/synapse/ml/fabric/token_utils.py", line 156, in _get_access_token_from_token_lib
    return PyTridentTokenLibrary.get_access_token_from_cache(resource)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/trusted-service-user/cluster-env/trident_env/lib/python3.11/site-packages/trident_token_library_wrapper.py", line 71, in get_access_token_from_cache
    raise IOError(err_msg)
OSError: Cache file does not exists. resource=$ml, path=$/nfs4/tridenttokenlibrary/tokens/ml.token

[P_work]

No need for restart for myself. Second run of notebook cell executed error-free and with no code changes.

[TomT131]

Hi,

Same error here since yesterday. Notebook used to run fine prior.
Couldnt find anything that references.

$/nfs4/tridenttokenlibrary/tokens/ml.token

After a restart, it seems to be resolved.

Is this a transient issue?
Cheers,

[aki_h · Accepted solution]

By logging out once and restarting the browser, it works fine again.

I don't know why this is the case, but I hope this information will be helpful to others who have had the same problem.