OSPF Multi area lab

Dear sir,

I have configured OSPF Multi-area as shown with area 0, 1 & 2.

But the thing is , I am not able to ping router 4 & 5 from router 7 & 8 , But from router 6 , am able to ping both, but I checked , router 7 & 8 both have all inter-area routing table in packet tracer.But one packet error is coming : “The routing table does not have a route to the destination IP address. The device drops the packet.”
Kindly suggest what should I do.

Joydeep Halder