求助GCDkit安装

在R上安装GCDkit 时，出现：
{Initializing the EarthChem interface....
curl support is absent...you may like to set up proxy manually (if present)
R proxy:
System proxy:
错误: package or namespace load failed for ‘GCDkit’:
attachNamespace()里算'GCDkit'时.onAttach失败了，详细内容：
  调用: source(paste(earthchem.dir, "EarthChemFUN.r", sep = "/"))
  错误: 句法分析器216行里不能有多字节字符}
请问如何解决？