Cryosparc install


I am trying to install cryosparc on my own laptop, here is the problem I encountered:

With the ‘prerequisite’ for installation, I was following the cryosparc guide command :

 ssh-keygen -t rsa -N "" -f $HOME/.ssh/id_rsa
 ssh-copy-id remote_username@remote_hostname (with my own username, of course),

it then returned:

Permission denied (publickey)
Does anyone know how to solve this problem?

Many thanks,