I am learning SUMO simulator for our project work .

1.As part of learning when I am trying to run the examples given under  

Warning: Cannot find local schema 
'/usr/lib/sumo/data/xsd/connections_file.xsd', will try website lookup.


Error: unable to resolve host/address 'sumo.dlr.de'
 In file 'data/pedcrossing.con.xml'
 At line/column 1/0.

Error: No nodes loaded.
Quitting (on error).
Network file 'pedcrossing.net.xml' not found

Even If I tried creating my own network file and then try using randomTrip to 
generate route file , same problem

python /home/adas/Documents/Wipod/Simulator\ -\ SDV\ in\ a\ 
Box/SUMO/sumo/tools/randomTrips.py --net-file=hello.net.xml -r hello.rou.xml -e 
50 -l
calling  duarouter -n hello.net.xml -r trips.trips.xml -o hello.rou.xml 
--ignore-errors --begin 0 --end 50.0 --no-step-log --no-warnings
Error: unable to resolve host/address 'sumo.dlr.de'
 In file 'trips.trips.xml'
 At line/column 1/0.

Quitting (on error).

Can you please provide some pointer for this

2.Another Query , go you have any interface for Unreal , like Unity

Thanks & Regards,

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    <edge from="1" id="1to2" to="2" />
    <edge from="2" id="out" to="3" />

<?xml version="1.0" encoding="UTF-8"?>

<!-- generated on Wed Jul 11 14:28:33 2018 by SUMO netconvert Version 0.28.0
<?xml version="1.0" encoding="UTF-8"?>

<configuration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/netconvertConfiguration.xsd";>

        <node-files value="test/hello.nod.xml"/>
        <edge-files value="test/hello.edg.xml"/>

        <output-file value="test/hello.net.xml"/>


<net version="0.27" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/net_file.xsd";>

    <location netOffset="250.00,0.00" convBoundary="0.00,0.00,501.00,0.00" origBoundary="-250.00,0.00,251.00,0.00" projParameter="!"/>

    <edge id=":2_0" function="internal">
        <lane id=":2_0_0" index="0" speed="13.90" length="0.10" shape="500.00,-1.65 500.00,-1.65"/>

    <edge id="1to2" from="1" to="2" priority="-1">
        <lane id="1to2_0" index="0" speed="13.90" length="500.00" shape="0.00,-1.65 500.00,-1.65"/>
    <edge id="out" from="2" to="3" priority="-1">
        <lane id="out_0" index="0" speed="13.90" length="1.00" shape="500.00,-1.65 501.00,-1.65"/>

    <junction id="1" type="unregulated" x="0.00" y="0.00" incLanes="" intLanes="" shape="0.00,-0.05 0.00,-3.25"/>
    <junction id="2" type="priority" x="500.00" y="0.00" incLanes="1to2_0" intLanes=":2_0_0" shape="500.00,-0.05 500.00,-3.25 500.00,-0.05">
        <request index="0" response="0" foes="0" cont="0"/>
    <junction id="3" type="unregulated" x="501.00" y="0.00" incLanes="out_0" intLanes="" shape="501.00,-3.25 501.00,-0.05"/>

    <connection from="1to2" to="out" fromLane="0" toLane="0" via=":2_0_0" dir="s" state="M"/>

    <connection from=":2_0" to="out" fromLane="0" toLane="0" dir="s" state="M"/>

    <node id="1" x="-250.0" y="0.0" />
    <node id="2" x="+250.0" y="0.0" />
    <node id="3" x="+251.0" y="0.0" />
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