ESP Datalogger (SQL)

Hy guys,
i try to use this library:

to save sensor data into an SQL database.
the example is working on my ESP32.

bit when i try to append it, it returns the error 7 - this is some read error.

i replaced the „init“ function with the „init_for_append“ which returns the error.

do somebody have an idea or experience how it works?

thank you!
(sorry for the format - i inserted it by mobilephone)