Error in curl::curl_fetch_memory(url, handle = handle) 请问该怎么解决啊

问题遇到的现象和发生背景 Error in curl::curl_fetch_memory(url, handle = handle) :

Could not resolve proxy: Proxy_Add_Here 请问该怎么解决啊，是网络不好吗，有时候正常，今晚怎么就是报错

用代码块功能插入代码，请勿粘贴截图

tmp_mart <- useMart(biomart = "ENSEMBL_MART_ENSEMBL",version = "Ensembl Genes 108")
Error in curl::curl_fetch_memory(url, handle = handle) :
Could not resolve proxy: Proxy_Add_Here