frequnacy divider with hspice

[FATEMEHABDI]

hi
i want to implement frequency divider 2 with d flip flop
i write this code

x1	vdd	0	vd	1	NOT
x2	vdd	0	1	vclk	2	and
x3	vdd	0	vd	vclk	3	and
		
x7	vdd	0	3	vq	4	or
x8	vdd	0	2	vqbar	5	or
x9	vdd	0	4	vqbar	NOT
x10	vdd	0	5	vq	NOT

but when i want to attach vqbar witn vd, hspice give error.
i don't know,
please help me