First time macports need help with PAN

[alien]

Hi everyone,

I am first time user using macports with high sierra 10.13., I was using
homebrew, since I want to install PAN http://pan.rebelbase.com/ so I
deleted homebrew, installed macports and I followed the instruction to
install PAN.

But when I start the program in terminal it said

(pan:1058): Gtk-WARNING **: 13:41:04.111: cannot open display:

I tried to the error message on google, but I cannot find, how to solve
this problem on high sierra.

Thank you in advance for your help and advise.
Best regards
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