'GCP Composer - ModuleNotFoundError: No module named 'airflow.providers.sftp'

I trying to getting data from FTP server's txt file by GCP Composer Tasks.

So I imported SFTPOperator package in code.

but error occurred:

ModuleNotFoundError: No module named 'airflow.providers.sftp'

then, I tried few ways:

but didn't work.😭

My GCP Composer Environment is as below:

How can I use SFTPOperator ?

Sources

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Solution	Source