SNMP checks not working

When I tried on CLI with cmk -vI command on the host:

  • FETCHING DATA
    [snmp] Execute data source
    [snmp] ERROR: too many values to unpack
    [piggyback] Execute data source
  • EXECUTING DISCOVERY PLUGINS (0)
    SUCCESS - Found nothing new

I also tried to create a new site with same version, it works fine.
So, there’s something wrong with current site but I don’t know where yet.