MPLS Problem

Hey This is my topoogy

R1--------------------------R2-----------------------------R3
| |
| |
| |
R4 R5

R1 an R3 is my PE and R4 and R5 are my customers I am forming MPBGP between
R1 and R3 and all routes are exchanged between R4 and R5
and all my imports r working fine
but i am getting this following error

%BGP-4-VPNV4NH_MASK: Nexthop 3.3.3.3 may not be reachable from neigbor
1.1.1.1 -^ not /32 mask

but all my ldp neighbourships are up
and i had done sh ip mpls ldp discovery det
everythin is fine i can able to ping my transport address
All the routes of R5 are in R4 and R1 routing table

but R4 cannot ping R4 and also R1 cannot ping R5

Pls anyone help

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