Sensehat pithon3

I am trying to use sensehat but this is the result:

File “<pyshell#1>”,line1, in
sense=SenseHat()
File “/usr/lib/python3/dist-packages/sense_hat/sense_hat.py”, line 39, in_ini_raise OSError(‘Cannot detect %s device’ %self.SENSE_HAT_FB_NAME)
OSError: Cannot detect RPi-sense FB device

Can you help ?
Thank you.