Gradle Error: Ionic build

Hi,

Getting below attached error while running ‘ionic cordova build android’.

`× cordova build android --debug - failed!
[ERROR] An error occurred while running cordova build android --debug (exit code 1):

    (truncated) ... t org.gradle.wrapper.Install.createDist(Install.java:48)
            at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:107)
            at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
    Caused by: sun.security.validator.ValidatorException: PKIX path building failed:
    sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested
    target
            at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:397)
            at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:302)
            at sun.security.validator.Validator.validate(Validator.java:260)
            at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
            at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
            at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
            at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1596)
            ... 20 more
    Caused by: 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:392)
            ... 26 more
    Error: cmd: Command failed with exit code 1 Error output:
    Exception in thread "main" 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.security.ssl.Alerts.getSSLException(Alerts.java:192)
            at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1959)
            at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:328)
            at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:322)
            at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1614)
            at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
            at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1052)
            at sun.security.ssl.Handshaker.process_record(Handshaker.java:987)
            at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1072)
            at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
            at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
            at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)
            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.getInputStream0(HttpURLConnection.java:1564)
            at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
            at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263)
            at org.gradle.wrapper.Download.downloadInternal(Download.java:66)
            at org.gradle.wrapper.Download.download(Download.java:51)
            at org.gradle.wrapper.Install$1.call(Install.java:62)
            at org.gradle.wrapper.Install$1.call(Install.java:48)
            at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:69)
            at org.gradle.wrapper.Install.createDist(Install.java:48)
            at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:107)
            at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
    Caused by: sun.security.validator.ValidatorException: PKIX path building failed:
    sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested
    target
            at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:397)
            at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:302)
            at sun.security.validator.Validator.validate(Validator.java:260)
            at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
            at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
            at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
            at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1596)
            ... 20 more
    Caused by: 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:392)
            ... 26 more
    Picked up _JAVA_OPTIONS: -Djava.net.preferIPv4Stack=true`

Please help.

Regards,
Pavithra D

If you have gradle error then install android studio

I have installed Android Studio Version 3.3