I get the following errors when I tried to install plugins.

sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:434)
Caused: sun.security.validator.ValidatorException: PKIX path building failed
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:439)
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:306)
at sun.security.validator.Validator.validate(Validator.java:271)
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:312)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:221)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:128)
at sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:636)
Caused: javax.net.ssl.SSLHandshakeException
at sun.security.ssl.Alert.createSSLException(Alert.java:131)
at sun.security.ssl.TransportContext.fatal(TransportContext.java:353)
at sun.security.ssl.TransportContext.fatal(TransportContext.java:296)
at sun.security.ssl.TransportContext.fatal(TransportContext.java:291)
at sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:652)
at sun.security.ssl.CertificateMessage$T12CertificateConsumer.onCertificate(CertificateMessage.java:471)
at sun.security.ssl.CertificateMessage$T12CertificateConsumer.consume(CertificateMessage.java:367)
at sun.security.ssl.SSLHandshake.consume(SSLHandshake.java:376)
at sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:444)
at sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:422)
at sun.security.ssl.TransportContext.dispatch(TransportContext.java:183)
at sun.security.ssl.SSLTransport.decode(SSLTransport.java:154)
at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1279)
at sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1188)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:401)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:373)
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:587)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
at sun.net.www.protocol.http.HttpURLConnection.followRedirect0(HttpURLConnection.java:2739)
at sun.net.www.protocol.http.HttpURLConnection.followRedirect(HttpURLConnection.java:2651)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1830)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:3061)
at java.net.URLConnection.getHeaderFieldLong(URLConnection.java:628)
at java.net.URLConnection.getContentLengthLong(URLConnection.java:500)
at java.net.URLConnection.getContentLength(URLConnection.java:484)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentLength(HttpsURLConnectionImpl.java:412)
at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1264)
Caused: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1950)
at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1945)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1944)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1514)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268)
at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1280)
Caused: java.io.IOException: Failed to load https://updates.jenkins.io/download/plugins/trilead-api/1.0.13/trilead-api.hpi to C:\WINDOWS\system32\config\systemprofile\AppData\Local\Jenkins\.jenkins\plugins\trilead-api.jpi.tmp
at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1287)
Caused: java.io.IOException: Failed to download from https://updates.jenkins.io/download/plugins/trilead-api/1.0.13/trilead-api.hpi (redirected to: https://ftp.yz.yamagata-u.ac.jp/pub/misc/jenkins/plugins/trilead-api/1.0.13/trilead-api.hpi)
at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1321)
at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1869)
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:2153)
at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1843)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:118)
at java.lang.Thread.run(Thread.java:748)