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git pull我正在尝试使用 Android Studio 的内置按钮执行，但失败并显示以下消息：

Git Pull Failed
                Invocation failed Unexpected end of file from server
                java.lang.RuntimeException: Invocation failed Unexpected end of file from server
                at org.jetbrains.git4idea.http.GitAskPassXmlRpcClient.askUsername(GitAskPassXmlRpcClient.java:55)
                at org.jetbrains.git4idea.http.GitAskPassApp.main(GitAskPassApp.java:66)
                Caused by: java.net.SocketException: Unexpected end of file from server
                at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:851)
                at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678)
                at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:848)
                at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678)
                at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1593)
                at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
                at org.apache.xmlrpc.DefaultXmlRpcTransport.sendXmlRpc(DefaultXmlRpcTransport.java:87)
                at org.apache.xmlrpc.XmlRpcClientWorker.execu... (show balloon)

这可能失败的原因是什么？