ssh-add : Invalid key length : <p>After my mac upgraded automatically, I try ssh-add fail:</p>

<pre><code>&gt;ssh-add
Enter passphrase for /Users/dan/.ssh/id_rsa:
Error loading key "/Users/dan/.ssh/id_rsa": Invalid key length

&gt;ssh -V
OpenSSH_7.6p1, LibreSSL 2.6.2
</code></pre>

<p>But how can I fix this issue?</p>

<p>Thanks!</p>
