SNMP Nbar says "no data available"

SNMP Nbar says "no data available"

Hi, Netflow Analyzer in installed on my server, NbarTest.sh says everything is ok :
 
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NbarTest.sh XX.XX.XX.XX 161 public
Device supports NBAR.
Trying to Get the values of protocols Table.
unknown
ftp
http
egp
gre
icmp






...
----------------------------------------------------------
 
The data is here, because when i do a show ip nbar protocol-discovery on my routeur, i have :
 
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#show ip nbar protocol-discovery
 GigabitEthernet0/0
 Last clearing of "show ip nbar protocol-discovery" counters 18w1d

                            Input                    Output
                            -----                    ------
   Protocol                 Packet Count             Packet Count
                            Byte Count               Byte Count
                            5min Bit Rate (bps)      5min Bit Rate (bps)
                            5min Max Bit Rate (bps)  5min Max Bit Rate (bps)
   ------------------------ ------------------------ ------------------------
   http                     1295904618               740908954
                            1756328553412            184558471558
                            5733000                  201000
                            47214000                 17051000
   ssh                      9553867                  7414507
                            6559543217               4321165850
                            0                        11000
                            22261000                 36551000
   secure-http              185844201                162256910
                            148049560931             59057182612
----------------------------------------------------------


















 
But i still have nothing (graph says "Aucune donnee disponible", and application nbar says "no result") when i choose snmp nbar on my interface... Have any clue of waht is wrong ? Thx.

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