i'm not able to run mosaic

[Alain Toussaint <alaint@boisfrancs.qc.ca>]

i tried to run mosaic (i've just installed it) and it gave me this
error,does anyone know what it mean ??

~$ Mosaic 
Couldn't open display: (NULL)
Error: Can't open display: 

thanks a lot.
Alain



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