Unsupported SNMP protocol error on Cisco devices

Hello,

we have got some problems to add our Cisco routers to the database:

Error: nav.Snmp.UnsupportedSnmpVersionError: Unsupported SNMP protocol version: 0

Unfortunately it happens to all our Cisco routers but not the Cisco switches. This Error Notify already occured in your mailling list with the hint:

jar -tf /usr/local/nav/lib/java/SimpleSnmp.jar

This is our output: nav:~# jar -tf /usr/local/nav/lib/java/SimpleSnmp.jar META-INF/ META-INF/MANIFEST.MF no/ no/ntnu/ no/ntnu/nav/ no/ntnu/nav/SimpleSnmp/ no/ntnu/nav/SimpleSnmp/SimpleSnmp.class no/ntnu/nav/SimpleSnmp/SimpleSnmpHP.class no/ntnu/nav/SimpleSnmp/TimeoutException.class

What can we do? We are running actually NAV 3.3.3 with SunJava 1.4.2.

Thanks in advance!

With kind regards Christian Baensch