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error invalid roslaunch xml syntax

<launch>

<node pkg = "hello_ros" type = "talker.py" name = "talker"/>

<node pkg = "hello_ros" type = "listener.py" name = "listener" output = "screen"/>

    <remap to = "chatter" from ="singing"/>

</node>

</launch>

output: Invalid roslaunch XML syntax: mismatched tag: line 9, column 6 The traceback for the exception was written to the log file

error invalid roslaunch xml syntax

<launch>

<launch>
        <node pkg = "hello_ros" type = "talker.py" name = "talker"/>

pkg="hello_ros" type="talker.py" name="talker"/>
        <node pkg = "hello_ros" type = "listener.py" name = "listener" output = "screen"/>

pkg="hello_ros" type="listener.py" name="listener" output="screen"/>
            <remap to = "chatter" from ="singing"/>

to="chatter" from="singing"/>
        </node>

</launch>

output: Invalid roslaunch XML syntax: mismatched tag: line 9, column 6 The traceback for the exception was written to the log file

error invalid roslaunch xml syntax

<launch> <node pkg="hello_ros" type="talker.py" name="talker"/> <node pkg="hello_ros" type="listener.py" name="listener" output="screen"/> <remap to="chatter" from="singing"/> </node> </launch>

output: Invalid roslaunch XML syntax: mismatched tag: line 9, column 6 The traceback for the exception was written to the log file

error invalid roslaunch xml syntax

launch file:

<launch>
    <node pkg = "hello_ros" type = "talker.py" name = "talker"/>
    <node pkg="hello_ros" type="talker.py" name="talker"/>
        <node pkg="hello_ros" type="listener.py" name="listener" output="screen"/>
    pkg = "hello_ros" type = "listener.py" name = "listener" output = "screen"/>
        <remap to="chatter" from="singing"/>
    to = "chatter" from ="singing"/>
    </node>
    </launch>

</launch>

output: Invalid roslaunch XML syntax: mismatched tag: line 9, column 6 The traceback for the exception was written to the log file