在RSTUDIO中载入gdata包时始终报错，也因此无法使用read()功能。电脑中已安装PERL，环境变量也已经设置过了，但始终报错，求大佬们有无解决方法

报错信息如下:

gdata: read.xls support for 'XLS' (Excel 97-2004) files ENABLED.

gdata: Unable to load perl libaries needed by read.xls()

gdata: to support 'XLSX' (Excel 2007+) files.

gdata: Run the function 'installXLSXsupport()'

gdata: to automatically download and install the perl

gdata: libaries needed to support Excel XLS and XLSX formats.

载入程辑包：‘gdata’

The following object is masked from ‘package:stats’:

  nobs

The following object is masked from ‘package:utils’:

  object.size

The following object is masked from ‘package:base’:

  startsWith

Warning messages:

1: In system(cmd, intern = intern, wait = wait | intern, show.output.on.console = wait, :

 running command 'C:\WINDOWS\system32\cmd.exe /c ftype perl' had status 2

2: In system(cmd, intern = intern, wait = wait | intern, show.output.on.console = wait, :

 running command 'C:\WINDOWS\system32\cmd.exe /c ftype perl' had status 2