No Oracle File System mounted

Summary:

Can't backup one of my free ATP database (21c) since today and when executing

SELECT * FROM DBMS_CLOUD.LIST_FILES('DATA_PUMP_DIR');

I got the error:

ERROR at line 1:

ORA-20000: No Oracle File System mounted

ORA-06512: at "C##CLOUD$SERVICE.DBMS_CLOUD", line 1679

ORA-06512: at "C##CLOUD$SERVICE.DBMS_CLOUD", line 9404

Any idea how to solve?

(my other ATP instance is fine)

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