背景：我正在 IBM Bluemix 上创建一个涉及使用 DashDB 的应用程序。从那里我打开了 R Studio。
我是 R 新手，我正在尝试在 R Studio 上安装rworldmap 。在安装时我检查了安装依赖项按钮。安装失败并在垃圾邮件包安装过程中出现了一些错误。
然后安装程序尝试安装以下依赖项（包）：
- 垃圾邮件
- 字段
垃圾邮件包安装警告/错误日志：
installing to /mnt/blumeta0/home/dash014837/R/x86_64-redhat-linux-gnu-library/3.2/spam/libs
** R
** data
*** moving datasets to lazyload DB
** demo
** inst
** preparing package for lazy loading
Error in setOldClass(c("dist", "numeric")) :
inconsistent old-style class information for “dist”; the class is defined but does not extend “numeric” and is not valid as the data part
Error : unable to load R code in package ‘spam’
ERROR: lazy loading failed for package ‘spam’
* removing ‘/mnt/blumeta0/home/dash014837/R/x86_64-redhat-linux-gnu-library/3.2/spam’
Warning in install.packages :
installation of package ‘spam’ had non-zero exit status
字段包安装警告/错误日志：
Attaching package: ‘arules’
The following objects are masked from ‘package:base’:
%in%, write
ERROR: dependency ‘spam’ is not available for package ‘fields’
* removing ‘/mnt/blumeta0/home/dash014837/R/x86_64-redhat-linux-gnu-library/3.2/fields’
Warning in install.packages :
installation of package ‘fields’ had non-zero exit status
rworldmaps包警告/错误日志：
The following objects are masked from ‘package:base’:
%in%, write
ERROR: dependency ‘fields’ is not available for package ‘rworldmap’
* removing ‘/mnt/blumeta0/home/dash014837/R/x86_64-redhat-linux-gnu-library/3.2/rworldmap’
Warning in install.packages :
installation of package ‘rworldmap’ had non-zero exit status
请帮我解决问题。