can't create a snmp-trap receiver

[frank0815]

snmp-server host x.x.x.x v1 community give the error:
%cannot modify settings
% Duplicate community string.

show snmp-server give me back:
Read-Only Community String: *********
Read-Write Community String: *********
Trap #1 IP Address: 0.0.0.0
Community String:
Trap #2 IP Address: 0.0.0.0
Community String:
Trap #3 IP Address: 0.0.0.0
Community String:
Trap #4 IP Address: 0.0.0.0
Community String:

Any ideas?

thx
Frank

[frank0815 · Accepted solution]

I clear all community entry with no snmp-server community ro | rw
Than works snmp-server host x.x.x.x v1 community