I'm new to networking and i'm currently learning about ipv6 in static routing. I set up an environment in cisco packet tracer like this: have connected two routers with serial medium , each router with a switch with a copper straight-through medium in GigabitEthernet interface and with FastEthernet interface I have connected each switch with each computer. And this are the commands for the routers:

R1(config) # interface GigabitEthernet 0/0

R1(config-if ) # ipv6 address 2001:DB8:ACAD:A::/64 eui-64

R1(config- if ) # no shutdown

R1(config-if ) # exit

R1(config) # interface Serial 0/1/0

R1(config) # ipv6 address FC00::1/64

R1(config- if ) # no shutdown

R1(config-if ) # exit

R1(config) #ipv6 ipv6 unicast-routing

R1(config) # ipv6 route 2001:DB8:ACAD:B::/64 Serial0/1/0

R1(config-if ) # exit

R2 Configuration

R2(config) # interface GigabitEthernet 0/0

R2(config-if ) # ipv6 address 2001:DB8:ACAD:B::/64 eui-64

R2(config- if ) # no shutdown

R2(config-if ) # exit

R2(config) # interface Serial 0/1/0

R2(config) # ipv6 address FC00::2/64

R2(config- if ) # no shutdown

R2(config-if ) # exit

R2(config) #ipv6 ipv6 unicast-routing

R2(config) # ipv6 route 2001:DB8:ACAD:A::/64 Serial0/1/0

R2(config-if ) # exit

Pc1: IPV6 address is : 2001:DB8:ACAD:A::F /64 and default gateway is : 2001:DB8:ACAD:A::1. / 2001:DB8:ACAD:B::1 and IPV6 addres : 2001:DB8:ACAD:B::F for the second pc. When i try to ping nothing happens though.What have i done wrong?