如何解决rtudio问题错误data.table_1.12.6.tgz？

Question

trying URL 'https://cran.rstudio.com/bin/macosx/el-capitan/contrib/3.6/data.table_1.12.6.tgz'
Content type 'application/x-gzip' length 2120957 bytes (2.0 MB)
==================================================
downloaded 2.0 MB

能帮我解决这个问题吗？