cp: missing destination file operand after '/etc/trafficserver/ssl/xxxx.com.ca.crt'

[poundra]

Please specify your private key file location (e.g., /etc/certs/qing.su.key):
/etc/certs/xxxx.com.key
Please specify your certificate file location (e.g., /etc/certs/qing.su.crt):
/etc/certs/xxxx.com.crt
Is your certificate chained? (i.e., are CA-certficates already included in your certificate file?) [Y/N]:
N
Please specify your CA-certificates file location (e.g., /etc/certs/qing.su.ca-bundle):

Configuring SSL certificates for xxx.xxx.xxx.xxx...
cp: missing destination file operand after '/etc/trafficserver/ssl/xxxx.com.ca.crt'
Try 'cp --help' for more information.
SSL certificates successfully configured.
Origin IP: xxx.xxx.xxx.xxx
Private key file: /etc/trafficserver/ssl/xxxx.com.key
Certificate file: /etc/trafficserver/ssl/xxxx.com.crt
Intermediate certificate: /etc/trafficserver/ssl/xxxx.com.ca.crt