Can Not Add Ecdsa Key To Ssh-add

OpenSSH_6.7p1, OpenSSL 1.0.1f 6 Jan 2014

I am having trouble adding a ecdsa key to ssh-add
However, I can add a rsa key without problem.

My file permissions:
Code:
id_ecdsa miati:miati-600
id_ecdsa.pub miati:miati-644
id_rsa miati:miati-600
id_rsa.pub miati:miati-644
/home/miati/.ssh/ miati:miati-700

When I try to add rsa & ecdsa

Code:
$ ssh-add id_rsa
Enter passphrase for id_rsa: 
Identity added: id_rsa (id_rsa)
$ ssh-add id_ecdsa
Enter passphrase for id_ecdsa: 
Error reading response length from authentication socket.
Could not add identity: id_ecdsa

My command to create each key

Code:
ssh-keygen -t rsa -b 4096
ssh-keygen -t ecdsa



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