error report

Loading BuildTools version: git-BuildTools-1847da7-45 (#45)
BuildTools
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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:619)
        at org.spigotmc.builder.Builder.main(Builder.java:171)
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:5                                                                                       24)
        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: javax.net.ssl.SSLException: java.security.ProviderException: java.sec                                                                                       urity.KeyException
        at sun.security.ssl.Alerts.getSSLException(Alerts.java:208)
        at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1916)
        at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1874)
        at sun.security.ssl.SSLSocketImpl.handleException(SSLSocketImpl.java:185                                                                                       7)
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1378                                                                                       )
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1355                                                                                       )
        at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:                                                                                       559)
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect                                                                                       (AbstractDelegateHttpsURLConnection.java:185)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLCon                                                                                       nection.java:1302)
        at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468                                                                                       )
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Htt                                                                                       psURLConnectionImpl.java:338)
        at org.eclipse.jgit.transport.http.JDKHttpConnection.getResponseCode(JDK                                                                                       HttpConnection.java:98)
        at org.eclipse.jgit.util.HttpSupport.response(HttpSupport.java:168)
        at org.eclipse.jgit.transport.TransportHttp.connect(TransportHttp.java:4                                                                                       75)
        ... 9 more
Caused by: java.security.ProviderException: java.security.KeyException
        at sun.security.ec.ECKeyPairGenerator.generateKeyPair(ECKeyPairGenerator                                                                                       .java:146)
        at java.security.KeyPairGenerator$Delegate.generateKeyPair(KeyPairGenera                                                                                       tor.java:704)
        at sun.security.ssl.ECDHCrypt.<init>(ECDHCrypt.java:78)
        at sun.security.ssl.ClientHandshaker.serverKeyExchange(ClientHandshaker.                                                                                       java:717)
        at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.jav                                                                                       a:278)
        at sun.security.ssl.Handshaker.processLoop(Handshaker.java:913)
        at sun.security.ssl.Handshaker.process_record(Handshaker.java:849)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1035)
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.                                                                                       java:1344)
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1371                                                                                       )
        ... 18 more
Caused by: java.security.KeyException
        at sun.security.ec.ECKeyPairGenerator.generateECKeyPair(Native Method)
        at sun.security.ec.ECKeyPairGenerator.generateKeyPair(ECKeyPairGenerator                                                                                       .java:126)
        ... 27 more