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DMVPN in Cisco 3945 output drop in tunnel interface

I configured DMVPN in Cisco 3945 and checked the tunnel interface. I found out that I have output drop. How can I remove that output drop? I already set the ip mtu to 1400.


CORE-ROUTER#sh int tunnel 20
Tunnel20 is up, line protocol is up
  Hardware is Tunnel
  Description: <Voice Tunneling to HO>
  Internet address is 172.15.X.X./X
  MTU 17878 bytes, BW 1024 Kbit/sec, DLY 50000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation TUNNEL, loopback not set
  Keepalive not set
  Tunnel source 10.15.X.X (GigabitEthernet0/1)
   Tunnel Subblocks:
         Tunnel20 source tracking subblock associated with GigabitEthernet0/1
          Set of tunnels with source GigabitEthernet0/1, 1 member (includes iterators), on interface <OK>
  Tunnel protocol/transport multi-GRE/IP
    Key 0x3EA, sequencing disabled
    Checksumming of packets disabled
  Tunnel TTL 255, Fast tunneling enabled
  Tunnel transport MTU 1438 bytes
  Tunnel transmit bandwidth 8000 (kbps)
  Tunnel receive bandwidth 8000 (kbps)
  Tunnel protection via IPSec (profile "tunnel_protection_profile_2")
  Last input 00:00:01, output never, output hang never
 --More--           Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 7487
  Queueing strategy: fifo
  Output queue: 0/0 (size/max)
  30 second input rate 0 bits/sec, 0 packets/sec
  30 second output rate 0 bits/sec, 0 packets/sec
     48007 packets input, 4315254 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     42804 packets output, 4638561 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out



interface Tunnel20
 description <Bayantel Voice tunneling>
 bandwidth 30720
 ip address 172.15.X.X
 no ip redirects
 ip mtu 1400
 no ip next-hop-self eigrp 20
 no ip split-horizon eigrp 20
 ip nhrp authentication 0r1x@IT
 ip nhrp map multicast dynamic
 ip nhrp network-id 1002
 ip nhrp holdtime 300
 ip tcp adjust-mss 1360
 tunnel source FastEthernet0/0/1
 tunnel mode gre multipoint
 tunnel key 1002
 tunnel protection ipsec profile tunnel_protection_profile_2 shared

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