Oracle Report Server could not start

I’m not able to start the report server, then i took the following steps in command line,
“rwserver -install rep_server_name”

But when i start the service i got no error message, the status was Started, but when i refresh it had stopped.
I look the smart agent icon disappears when i move the mouse over it.

I have try to restart computer, but it still could not start.
Then i try to use this command,
“rwserver server=rep_server_name”

It come with messages that report server is starting up and then i click the shutting down button.

I start the report service again, then user can print report again.