How can I debug of adjustOHLC() - r

I am learning quantmod package. I wrote following codes, but R shows me error. Please help me!
getSymbols("AMZN", from = "2010-01-01", to = "2019-12-20", src = "yahoo")
AMZN_adj = adjustOHLC(AMZN)
The error is
Error in vapply(parse(text = fr[, 2]), eval, numeric(1)) :
values must be length 1,
but FUN(X[[1]]) result is length 3
In addition: Warning message:
In read.table(file = file, header = header, sep = sep, quote = quote, :
incomplete final line found by readTableHeader on 'C:\Users\User\AppData\Local\Temp\RtmpmYhsTS\file964478a68e'
I have check the source code of the function adjustOHLC(), I couldn't find vapply(parse()) anywhere.
Can someone help me to explain what happens in my code?

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