关于这个R警告信息

Question

使用R-package时，我收到以下警告：

install.packages("poweRlaw")  
install.packages("devtools")   
library("poweRlaw")  

Warning messages:
1: In installClassMethod(value, self, field, selfEnv, thisClass) :
  method .objectPackage from class conpl was not processed into a class
  method until being installed.  Possible corruption of the methods in the class.  

2: In installClassMethod(value, self, field, selfEnv, thisClass) :
  method .objectParent from class conpl was not processed into a class
  method until being installed.  Possible corruption of the methods in the class.

我需要安装什么样的软件包？