Can't join the server and Launcher doesn't work too

[Carthon]

Hi I've been playing for 2 hours in the server, but after a restart i could not connect. I tried to download the launcher but i get the following error:

Quote

To report this error, please provide:

java.io.IOException: The list of modpacks could not be downloaded.
    at com.skcraft.launcher.InstanceList$Enumerator.call(InstanceList.java:191)
    at com.skcraft.launcher.InstanceList$Enumerator.call(InstanceList.java:102)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.ssl.Alerts.getSSLException(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
    at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
    at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
    at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
    at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
    at sun.security.ssl.Handshaker.processLoop(Unknown Source)
    at sun.security.ssl.Handshaker.process_record(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(Unknown Source)
    at com.skcraft.launcher.util.HttpRequest.execute(HttpRequest.java:141)
    at com.skcraft.launcher.InstanceList$Enumerator.call(InstanceList.java:138)
    ... 5 more
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(Unknown Source)
    at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
    at sun.security.validator.Validator.validate(Unknown Source)
    at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
    at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
    at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
    ... 18 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 Source)
    at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
    at java.security.cert.CertPathBuilder.build(Unknown Source)
    ... 24 more

I'll attach the minecraft log too.

log.txt

[Ness27]

Delete: 
D:\Programs\CrafterLand Launcher\launcher

 

Or the launcher folder, wherever you have it saved

Re-install and update to new launcher version

[Carthon]

I didnt install the launcher. I tried to but didn't let me getting that error. So i dont have that folder or such of. I did play with Twitch downloading the Dungeons, Dragons and Space Shuttles pack.

For the launcher tho, if you check the error it says i need a certificate in order to download files from that URL. If i could see the launcher source code I could resolve it by myself but i dont actually know what certificate do I need or if i have to disable Java Security to download the files.