> install.packages("quantmod")
Installing package into ‘C:/Users/123/Documents/R/win-library/3.4’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.4/quantmod_0.4-12.zip'
Content type 'application/zip' length 487516 bytes (476 KB)
downloaded 476 KB

package ‘quantmod’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
        C:\Users\123\AppData\Local\Temp\RtmpmUDosd\downloaded_packages

安装每个包的结果都是这样，请问是哪里出了问题吗？
请各位大神指教！