RuntimeError: should never launch viewer in embedded mode
In Sage version 6.3, next exemple is OK:
L = [plot(k*x,(x,-1,1)) for k in [1..3]];G = graphics_array(L);G.show(figsize=[5,3])
But in Sage version 6.4 and 6.5, we have error message
RuntimeError: should never launch viewer in embedded mode
Is there something wrong? Thanks