'Couldn't change Indeed url while scraping with R

i'm new to programming!

I use R for data mining, i'm scraping Indeed and my code works good until I change the URL, it gives me this error :

Error in names(x) <- value : 
  'names' attribute [5] must be the same length as the vector [1]

But if I wait a few minutes the code with new URL works again!!!!

Do you know what the problem is?

thank you!

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