Question - Why you get "Router may have only one child element" warning? 
          
        
        Answer - 
        
It is because you have not to wrap your Route's in a 
 block or  block which renders a route exclusively.
Example
render((  
    
      
      
    
)  
should be
render(  
    
      
        
        
      
    
)  
        
        
        
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