[ibr-dtn] PLEASE HELP> ERROR ApiServer: Cannot bind to socket with address [::1]:4550

Hello Dears, I am trying to use IBR-DTN in my thesis and I have following problem:

While trying to use deamon. The error I get is: ERROR ApiServer: Cannot bind to socket with address [::1]:4550

I tried: 1-disabled ipv6 then (ipv4 port listener also gone) 2-change dtndconf bind interface to : 127.0.0.1 3- almost checked all mailing list and FAQ of IBR-DTN.

still nothing... please help me