[Paparazzi-devel] I get error while it's installing from source

[????????]

Hi,all.

     I have tried to install paparazzi from source.However,I still get error after that I input the command "sudo port install paparazzi-tools".

Here is the error:

--->  Installing rsync @3.0.9_2

--->  Activating rsync @3.0.9_2

Error: org.macports.activate for port rsync returned: Image error: /Library/LaunchDaemons/org.macports.rsyncd.plist already exists and does not belong to a registered port.  Unable to activate port rsync. Use 'port -f activate rsync' to force the activation.

Error: Failed to install rsync

Is the error caused by the connection problem or by anything else?How could I fix it?Thank's a lot!