[R] Need to read an Excel File

[rajibshibly]

I am trying to read an Excel file using the following:
a<-read.xls("mydata.xls", sheet=1)

The file mydata.xls is stored in the working directory. However I am getting
the following error. Can anyone help.

Error in findPerl(verbose = verbose) : 
  perl executable not found. Use perl= argument to specify the correct path.
Error in file.exists(tfn) : invalid 'file' argument

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