[21:27:29 WARN]: Error occured during retriving version
java.lang.Throwable
        at kcauldron.KLog.log(KLog.java:30) [KLog.class:1.7.10-R0.1-SNAPSHOT]
        at kcauldron.KLog.warning(KLog.java:41) [KLog.class:1.7.10-R0.1-SNAPSHOT
]
        at kcauldron.updater.KVersionRetriever.uncaughtException(KVersionRetriev
er.java:114) [KVersionRetriever.class:1.7.10-R0.1-SNAPSHOT]
        at kcauldron.updater.KVersionRetriever.check(KVersionRetriever.java:108)
 [KVersionRetriever.class:1.7.10-R0.1-SNAPSHOT]
        at kcauldron.updater.KVersionRetriever.run(KVersionRetriever.java:69) [K
VersionRetriever.class:1.7.10-R0.1-SNAPSHOT]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_77]
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.Validator
Exception: PKIX path building failed: sun.security.provider.certpath.SunCertPath
BuilderException: unable to find valid certification path to requested target
        at sun.security.ssl.Alerts.getSSLException(Unknown Source) ~[?:1.8.0_77]

        at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source) ~[?:1.8.0_77]
        at sun.security.ssl.Handshaker.fatalSE(Unknown Source) ~[?:1.8.0_77]
        at sun.security.ssl.Handshaker.fatalSE(Unknown Source) ~[?:1.8.0_77]
        at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source) ~
[?:1.8.0_77]
        at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source) ~[?:
1.8.0_77]
        at sun.security.ssl.Handshaker.processLoop(Unknown Source) ~[?:1.8.0_77]

        at sun.security.ssl.Handshaker.process_record(Unknown Source) ~[?:1.8.0_
77]
        at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source) ~[?:1.8.0_7
7]
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source
) ~[?:1.8.0_77]
        at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source) ~[?:1.8
.0_77]
        at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source) ~[?:1.8
.0_77]
        at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSock
et(SSLConnectionSocketFactory.java:394) ~[SSLConnectionSocketFactory.class:4.4.1
]
        at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSL
ConnectionSocketFactory.java:353) ~[SSLConnectionSocketFactory.class:4.4.1]
        at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect
(DefaultHttpClientConnectionOperator.java:134) ~[DefaultHttpClientConnectionOper
ator.class:4.4.1]
        at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(
PoolingHttpClientConnectionManager.java:353) ~[PoolingHttpClientConnectionManage
r.class:4.4.1]
        at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClie
ntExec.java:380) ~[MainClientExec.class:4.4.1]
        at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.
java:236) ~[MainClientExec.class:4.4.1]
        at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java
:184) ~[ProtocolExec.class:4.4.1]
        at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) ~
[RetryExec.class:4.4.1]
        at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java
:110) ~[RedirectExec.class:4.4.1]
        at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttp
Client.java:184) ~[InternalHttpClient.class:4.4.1]
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttp
Client.java:82) ~[CloseableHttpClient.class:4.4.1]
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttp
Client.java:107) ~[CloseableHttpClient.class:4.4.1]
        at kcauldron.updater.KVersionRetriever.check(KVersionRetriever.java:92)
~[KVersionRetriever.class:1.7.10-R0.1-SNAPSHOT]
        ... 2 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed:
 sun.security.provider.certpath.SunCertPathBuilderException: unable to find vali
d certification path to requested target
        at sun.security.validator.PKIXValidator.doBuild(Unknown Source) ~[?:1.8.
0_77]
        at sun.security.validator.PKIXValidator.engineValidate(Unknown Source) ~
[?:1.8.0_77]
        at sun.security.validator.Validator.validate(Unknown Source) ~[?:1.8.0_7
7]
        at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source) ~[?:1.
8.0_77]
        at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source) ~[
?:1.8.0_77]
        at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Sour
ce) ~[?:1.8.0_77]
        at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source) ~
[?:1.8.0_77]
        at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source) ~[?:
1.8.0_77]
        at sun.security.ssl.Handshaker.processLoop(Unknown Source) ~[?:1.8.0_77]

        at sun.security.ssl.Handshaker.process_record(Unknown Source) ~[?:1.8.0_
77]
        at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source) ~[?:1.8.0_7
7]
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source
) ~[?:1.8.0_77]
        at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source) ~[?:1.8
.0_77]
        at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source) ~[?:1.8
.0_77]
        at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSock
et(SSLConnectionSocketFactory.java:394) ~[SSLConnectionSocketFactory.class:4.4.1
]
        at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSL
ConnectionSocketFactory.java:353) ~[SSLConnectionSocketFactory.class:4.4.1]
        at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect
(DefaultHttpClientConnectionOperator.java:134) ~[DefaultHttpClientConnectionOper
ator.class:4.4.1]
        at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(
PoolingHttpClientConnectionManager.java:353) ~[PoolingHttpClientConnectionManage
r.class:4.4.1]
        at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClie
ntExec.java:380) ~[MainClientExec.class:4.4.1]
        at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.
java:236) ~[MainClientExec.class:4.4.1]
        at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java
:184) ~[ProtocolExec.class:4.4.1]
        at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) ~
[RetryExec.class:4.4.1]
        at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java
:110) ~[RedirectExec.class:4.4.1]
        at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttp
Client.java:184) ~[InternalHttpClient.class:4.4.1]
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttp
Client.java:82) ~[CloseableHttpClient.class:4.4.1]
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttp
Client.java:107) ~[CloseableHttpClient.class:4.4.1]
        at kcauldron.updater.KVersionRetriever.check(KVersionRetriever.java:92)
~[KVersionRetriever.class:1.7.10-R0.1-SNAPSHOT]
        ... 2 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to
 find valid certification path to requested target
        at sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Sourc
e) ~[?:1.8.0_77]
        at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown
 Source) ~[?:1.8.0_77]
        at java.security.cert.CertPathBuilder.build(Unknown Source) ~[?:1.8.0_77
]
        at sun.security.validator.PKIXValidator.doBuild(Unknown Source) ~[?:1.8.
0_77]
        at sun.security.validator.PKIXValidator.engineValidate(Unknown Source) ~
[?:1.8.0_77]
        at sun.security.validator.Validator.validate(Unknown Source) ~[?:1.8.0_7
7]
        at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source) ~[?:1.
8.0_77]
        at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source) ~[
?:1.8.0_77]
        at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Sour
ce) ~[?:1.8.0_77]
        at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source) ~
[?:1.8.0_77]
        at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source) ~[?:
1.8.0_77]
        at sun.security.ssl.Handshaker.processLoop(Unknown Source) ~[?:1.8.0_77]

        at sun.security.ssl.Handshaker.process_record(Unknown Source) ~[?:1.8.0_
77]
        at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source) ~[?:1.8.0_7
7]
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source
) ~[?:1.8.0_77]
        at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source) ~[?:1.8
.0_77]
        at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source) ~[?:1.8
.0_77]
        at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSock
et(SSLConnectionSocketFactory.java:394) ~[SSLConnectionSocketFactory.class:4.4.1
]
        at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSL
ConnectionSocketFactory.java:353) ~[SSLConnectionSocketFactory.class:4.4.1]
        at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect
(DefaultHttpClientConnectionOperator.java:134) ~[DefaultHttpClientConnectionOper
ator.class:4.4.1]
        at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(
PoolingHttpClientConnectionManager.java:353) ~[PoolingHttpClientConnectionManage
r.class:4.4.1]
        at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClie
ntExec.java:380) ~[MainClientExec.class:4.4.1]
        at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.
java:236) ~[MainClientExec.class:4.4.1]
        at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java
:184) ~[ProtocolExec.class:4.4.1]
        at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) ~
[RetryExec.class:4.4.1]
        at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java
:110) ~[RedirectExec.class:4.4.1]
        at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttp
Client.java:184) ~[InternalHttpClient.class:4.4.1]
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttp
Client.java:82) ~[CloseableHttpClient.class:4.4.1]
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttp
Client.java:107) ~[CloseableHttpClient.class:4.4.1]
        at kcauldron.updater.KVersionRetriever.check(KVersionRetriever.java:92)
~[KVersionRetriever.class:1.7.10-R0.1-SNAPSHOT]
        ... 2 more