Unable to get powerline-color-main-1 value

[dineshwar]

I'm trying to set the color for client_prefix in my tmux configuration. I use the following configuration:

`set -g @powerline-status-left-area-left-bg "#{?client_prefix,cyan,@powerline-color-main-1}".

However, this doesn't work. Can you please tell me what I'm doing wrong?