Andrea Reginato andreareginato

## README.md

      
        
          
            
              
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                jmarceli
                / README.md
            
            
              Last active
              October 31, 2019 09:46
            
              
                React errors explained
              
          
        
      
        
  
      
    1

You will get one of these:
Uncaught (in promise) TypeError: Cannot read property 'toUpperCase' of undefined(…)

ReactCompositeComponent.js:870 Uncaught TypeError: Cannot read property 'displayName' of undefined

if you try to: