INstall ECC error :uiengine: no GUI connected

When i install ECC 5.0 ,and run the ./sapinst ,system give me the error :guiengine: no GUI connected; waiting for a connection on host <host_name> port 21212 to continue with the installation"

and i find one notes told me : Solution:

You reconnect with the GUI to SAPinst and enter the path to the software package or file manually. Then you can continue with the installation.

but how can i do?

thanks.