The problem looks like below:
:: problems summary ::
:::: WARNINGS
module not found: org.scala-sbt#sbt;0.13.7
==== local: tried
/home/jiakui/.ivy2/local/org.scala-sbt/sbt/0.13.7/ivys/ivy.xml
-- artifact org.scala-sbt#sbt;0.13.7!sbt.jar:
/home/jiakui/.ivy2/local/org.scala-sbt/sbt/0.13.7/jars/sbt.jar
==== typesafe-ivy-releases: tried
https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/sbt/0.13.7/ivys/ivy.xml
==== Maven Central: tried
https://repo1.maven.org/maven2/org/scala-sbt/sbt/0.13.7/sbt-0.13.7.pom
-- artifact org.scala-sbt#sbt;0.13.7!sbt.jar:
https://repo1.maven.org/maven2/org/scala-sbt/sbt/0.13.7/sbt-0.13.7.jar
::::::::::::::::::::::::::::::::::::::::::::::
:: UNRESOLVED DEPENDENCIES ::
::::::::::::::::::::::::::::::::::::::::::::::
:: org.scala-sbt#sbt;0.13.7: not found
::::::::::::::::::::::::::::::::::::::::::::::
:::: ERRORS
Server access Error: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target url=https://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/sbt/0.13.7/ivys/ivy.xml
Server access Error: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target url=https://repo1.maven.org/maven2/org/scala-sbt/sbt/0.13.7/sbt-0.13.7.pom
Server access Error: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target url=https://repo1.maven.org/maven2/org/scala-sbt/sbt/0.13.7/sbt-0.13.7.jar
:: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS unresolved dependency: org.scala-sbt#sbt;0.13.7: not found Error during sbt execution: Error retrieving required libraries (see /home/jiakui/.sbt/boot/update.log for complete log) Error: Could not retrieve sbt 0.13.7 + exit 1
sbt sbtVersion
)? – mariosscala -version
to get the runtime version. In case you specify a different version in your build.sbt, send me that one as well. – marios