BuildTools installation error.

BuildTools
unconfigured@null.spigotmc.org
Starting clone of https://hub.spigotmc.org/stash/scm/spigot/bukkit.git to Bukkit
Exception in thread "main" org.eclipse.jgit.api.errors.TransportException: https://hub.spigotmc.org/stash/scm/spigot/bukkit.git: cannot open git-upload-pack
	at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:139)
	at org.eclipse.jgit.api.CloneCommand.fetch(CloneCommand.java:187)
	at org.eclipse.jgit.api.CloneCommand.call(CloneCommand.java:127)
	at org.spigotmc.builder.Builder.clone(Builder.java:582)
	at org.spigotmc.builder.Builder.main(Builder.java:153)
Caused by: org.eclipse.jgit.errors.TransportException: https://hub.spigotmc.org/stash/scm/spigot/bukkit.git: cannot open git-upload-pack
	at org.eclipse.jgit.transport.TransportHttp.connect(TransportHttp.java:524)
	at org.eclipse.jgit.transport.TransportHttp.openFetch(TransportHttp.java:309)
	at org.eclipse.jgit.transport.FetchProcess.executeImp(FetchProcess.java:136)
	at org.eclipse.jgit.transport.FetchProcess.execute(FetchProcess.java:122)
	at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1138)
	at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:130)
	... 4 more
Caused by: java.net.SocketException: Unrecognized Windows Sockets error: 10106: create
	at java.net.Socket.createImpl(Unknown Source)
	at java.net.Socket.connect(Unknown Source)
	at sun.security.ssl.SSLSocketImpl.connect(Unknown Source)
	at sun.net.NetworkClient.doConnect(Unknown Source)
	at sun.net.www.http.HttpClient.openServer(Unknown Source)
	at sun.net.www.http.HttpClient.openServer(Unknown Source)
	at sun.net.www.protocol.https.HttpsClient.<init>(Unknown Source)
	at sun.net.www.protocol.https.HttpsClient.New(Unknown Source)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at java.net.HttpURLConnection.getResponseCode(Unknown Source)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown Source)
	at org.eclipse.jgit.transport.http.JDKHttpConnection.getResponseCode(JDKHttpConnection.java:98)
	at org.eclipse.jgit.util.HttpSupport.response(HttpSupport.java:168)
	at org.eclipse.jgit.transport.TransportHttp.connect(TransportHttp.java:475)
	... 9 more