mongodump : tls: failed to parse private key

When using mongodump on tls configured mongodb 4.2.8 I get following error :

Failed: can't create session: error configuring the connector: error configuring client, can't load client certificate: tls: failed to parse private key

Connection using mongo client 4.2.8 works with tls parameters.

Mongodump 4.2.8 still uses ssl parameters and throw me the above error.