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I copied and pasted following:

   1 <launch>
   2 
   3   <group ns="turtlesim1">
   4     <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
   5   </group>
   6 
   7 ...

If that is an actual copy-paste, then the problem are the line number.

Those are not supposed to be there.

Remove them and try again.

I copied and pasted following:

   1 <launch>
   2 
   3   <group ns="turtlesim1">
   4     <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
   5   </group>
   6 
   7 ...

If that is an actual copy-paste, then the problem are the line number.numbers.

Those are not supposed to be there.

Remove them and try again.

I copied and pasted following:

   1 <launch>
   2 
   3   <group ns="turtlesim1">
   4     <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
   5   </group>
   6 
   7 ...

If that is an actual copy-paste, then the problem are is the line numbers.

Those are not supposed to be there.

Remove them and try again.