Error Messages in R after a for loop -

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It's a bit of a shot in the dark, but I have a script that I expect to do right However, at the very end of the script I get an error like this: 

  error [& lt; - data.frame (`* * tmp *`, "label", value = c (1l, 0l)): there are 2 rows in the replacement, 0 in the data   
 one answer In terms of, I am looking for general tips on how to track such errors R, best practice to use Loops and double checking that he "made it"  
 Also ideas, suggestions, or previous experiences that could delete or notify an error message like this? 
 
 
 I have already added my comments about debugging practices but you have shown specific About the message: This means that you want to write 2 rows in some datasets which have 0 rows. Something like this:  
  x

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