i dont know where i can find the log but i think this is the log (if it is incorrect please tell me to chnage it and send you another log)
https://pastebin.com/bK4fuYHJ
Hi,my problem is:when i launch forge and click on install a message appear says "Failed to run processor: javax.net.ssl.SSLHandshakeException:PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"