R：Ryacas包在Mac上运行不正常

Question

我无法让Ryacas软件包在Mac上运行。我一直收到这个错误：

[1] "Starting Yacas!"
In> Error in socketConnection(host = "127.0.0.1", port = 9734, server = FALSE,  :  cannot open the connection
In addition: Warning message:
In socketConnection(host = "127.0.0.1", port = 9734, server = FALSE,  : 127.0.0.1:9734 cannot be opened

非常感谢任何帮助。