This message appeal on the server console after start server.
23:15:52 !!! [CE][DE] DynamicEvent "InfectedNBCYellow" has no children defined, at least one is required for this type of event.
23:15:52 !!!!!! [CE][DE] DynamicEvent "InfectedNBCYellow" setup is invalid, event will be disabled.
And the child definiton is missing from events.
<event name="InfectedNBCYellow">
<nominal>50</nominal>
<min>25</min>
<max>250</max>
<lifetime>3</lifetime>
<restock>0</restock>
<saferadius>100</saferadius>
<distanceradius>50</distanceradius>
<cleanupradius>100</cleanupradius>
<flags deletable="0" init_random="0" remove_damaged="1"/>
<position>player</position>
<limit>custom</limit>
<active>1</active>
<children/>
</event>