question for mininet command xterm and contrller ptcp:

Dear Team,

I install ODL and Mininet in the same VM

mn —topo single,3 —mac —switch ovsk —controller remote

mininet>xterm h1
Error:Cannot connect to display————————————first error

then i open another ssh session ,

run command :

root@xxx#controller ptcp:———————————————-second error
Feb 17 21:57:30|00001|vconn_tcp|ERR|ptcp:: bind: Address already in use
Feb 17 21:57:30|00002|controller|ERR|ptcp:: connect: Address already in use
controller: no active or passive switch connection

could you please tell me how to solve it ???

thanks a lot