cannot open gnome-terminal

I installed gnome-terminal via apt-get, its needed by my project

When I type gnome-terminal to open it, it sends an error: Unable to init server: Could not connect: Connection refused # Failed to parse arguments: Cannot open display:

What can I do?

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You should be able to sort the issue by running:

export DISPLAY=:0.0

before invoking the program itself.

Let me know how it goes.