The main issue is it looks like Java is not configured to accept the invalid ssl cert that is coming from the download location.

Exception in thread "main" java.lang.RuntimeException: javax.net.ssl.SSLException: java.security.ProviderException: java.security.InvalidKeyException: EC parameters error

 export ANDROID_HOME=/home/user/Downloads/tools/
Conversations-master$ ./gradlew
Downloading https://services.gradle.org/distributions/gradle-4.4-all.zip

Exception in thread "main" java.lang.RuntimeException: javax.net.ssl.SSLException: java.security.ProviderException: java.security.InvalidKeyException: EC parameters error
    at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:78)
    at org.gradle.wrapper.Install.createDist(Install.java:47)
    at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
    at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
Caused by: javax.net.ssl.SSLException: java.security.ProviderException: java.security.InvalidKeyException: EC parameters error
    at sun.security.ssl.Alerts.getSSLException(Alerts.java:208)
    at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1914)
    at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1872)
    at sun.security.ssl.SSLSocketImpl.handleException(SSLSocketImpl.java:1855)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1376)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1353)
    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(HttpURLConnection.java:1366)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263)
    at org.gradle.wrapper.Download.downloadInternal(Download.java:59)
    at org.gradle.wrapper.Download.download(Download.java:45)
    at org.gradle.wrapper.Install$1.call(Install.java:60)
    at org.gradle.wrapper.Install$1.call(Install.java:47)
    at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65)
    ... 3 more
Caused by: java.security.ProviderException: java.security.InvalidKeyException: EC parameters error
    at sun.security.pkcs11.P11Key$P11ECPublicKey.getEncodedInternal(P11Key.java:1024)
    at sun.security.pkcs11.P11Key.equals(P11Key.java:158)
    at java.util.ArrayList.indexOf(ArrayList.java:302)
    at java.util.ArrayList.contains(ArrayList.java:285)
    at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:239)
    at sun.security.validator.Validator.validate(Validator.java:260)
    at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:326)
    at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
    at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:126)
    at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1459)
    at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:213)
    at sun.security.ssl.Handshaker.processLoop(Handshaker.java:961)
    at sun.security.ssl.Handshaker.process_record(Handshaker.java:897)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1033)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1342)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1369)
    ... 13 more
Caused by: java.security.InvalidKeyException: EC parameters error
    at sun.security.ec.ECParameters.getAlgorithmParameters(ECParameters.java:284)
    at sun.security.ec.ECPublicKeyImpl.<init>(ECPublicKeyImpl.java:59)
    at sun.security.pkcs11.P11Key$P11ECPublicKey.getEncodedInternal(P11Key.java:1021)
    ... 28 more
Caused by: java.security.NoSuchProviderException: no such provider: SunEC
    at sun.security.jca.GetInstance.getService(GetInstance.java:83)
    at sun.security.jca.GetInstance.getInstance(GetInstance.java:206)
    at java.security.Security.getImpl(Security.java:697)
    at java.security.AlgorithmParameters.getInstance(AlgorithmParameters.java:199)
    at sun.security.ec.ECParameters.getAlgorithmParameters(ECParameters.java:279)
    ... 30 more
 

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