Symptom:
After adding P2P dynamic-flow-detection following errors are seen in GGSN.

Customer:       SFR - France
Platform:       ASR5000
Product:        GGSN-SPGW
Software Build: 14.0.52055

2014-Apr-10+10:44:57.804 [acsmgr 91779 error] [2/0/5259 <sessmgr:163> acsmgr_stats.c:10261] [callid 3049d375] [context: billing, contextID: 7]  [software internal system syslog] unknown flows > total flows unknown:-1 total:1, mismatched protocols:
2014-Apr-10+10:44:57.803 [acsmgr 91779 error] [12/0/5234 <sessmgr:153> acsmgr_stats.c:10261] [callid 2d4f18e7] [context: billing, contextID: 7]  [software internal system syslog] unknown flows > total flows unknown:-1 total:1, mismatched protocols:
2014-Apr-10+10:44:57.803 [acsmgr 91779 error] [10/0/5234 <sessmgr:151> acsmgr_stats.c:10261] [callid 2cb6c10a] [context: billing, contextID: 7]  [software internal system syslog] unknown flows > total flows unknown:-3 total:3, mismatched protocols:
2014-Apr-10+10:44:57.803 [acsmgr 91779 error] [12/0/5234 <sessmgr:153> acsmgr_stats.c:10261] [callid 2d4f1768] [context: billing, contextID: 7]  [software internal system syslog] unknown flows > total flows unknown:-1 total:5, mismatched protocols:
 
[local]cha3spgw01# show active-charging sessions summary
Thursday April 10 19:06:27 CEST 2014
 
Warning: Statistics are corrupted since the number of unknown flows exceed the total number of flows
Total Active Charging Sessions: 1848917       
  Uplink Bytes:             1359140683371  Downlink Bytes:          8464724403989
  Uplink Packets:              8254717401  Downlink Packets:           9467312769

Conditions:
After adding following P2P Detection config in ASR5K:

[local]cha3spgw01# show plugin
Friday April 11 09:58:59 CEST 2014
plugin p2p
  patch-directory /var/opt/lib
  base-directory /lib
  base-version 1.50.52055
  module priority 9 version 1.82.193

[local]cha3spgw01# show module
STRING[1..16]       |         <cr>
[local]cha3spgw01# show module
Friday April 11 09:59:05 CEST 2014
Module p2p
   Priority   version  loaded     location       update/rollback time     status
        9   1.82.193    yes    /var/opt/lib   Fri Apr 11 09:53:15 2014   success
        X 1.50.52055     no            /lib                  (never)     N/A