Netflow not exporting flows

I am already running Netflow on one router and is monitoring 2 interfaces of that router, now i have enabled netflow on another router too i mean on the interfaces but NFA is not getting any traffic from that router, even though i have done exactly same configuration on both routers.
following is the output:
RTR2811#sh ip cache flow
IP packet size distribution (501376 total packets):
1-32 64 96 128 160 192 224 256 288 320 352 384 416 448 480
.000 .625 .013 .019 .013 .003 .003 .002 .026 .004 .006 .005 .004 .005 .005

512 544 576 1024 1536 2048 2560 3072 3584 4096 4608
.004 .005 .030 .032 .186 .000 .000 .000 .000 .000 .000

IP Flow Switching Cache, 278544 bytes
0 active, 4096 inactive, 34557 added
542154 ager polls, 0 flow alloc failures
Active flows timeout in 1 minutes
Inactive flows timeout in 15 seconds
IP Sub Flow Cache, 21640 bytes
0 active, 1024 inactive, 34557 added, 34557 added to flow
0 alloc failures, 0 force free
1 chunk, 2 chunks added

LHR01-RTR2811-02#sh ip flow export
Flow export v5 is enabled for main cache
Exporting flows to 172.16.1.30 (9996)
Exporting using source interface FastEthernet0/0
Version 5 flow records
34557 flows exported in 1159 udp datagrams
0 flows failed due to lack of export packet
0 export packets were sent up to process level
0 export packets were dropped due to no fib
0 export packets were dropped due to adjacency issues
0 export packets were dropped due to fragmentation failures
0 export packets were dropped due to encapsulation fixup failures

please tell me why is this problem occuring?