In order to post questions and comments effectively, read Markup in the Monastery. Specifically, use <code>...</code> tags around code.

Regarding your problem it seems that you need to install a newer version of Math::BigInt.

Also, Net::SFTP is unmaintained and has several unsolved bugs. Nowadays Net::SFTP::Foreign or Net::SSH2 are better options.

In reply to Re^2: How to use identity files in Net::SFTP by salva
in thread How to use identity files in Net::SFTP by rachanakunal

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