To summarise the fix: edit or create the file `~/.sbtconfig` and add the line: SBT_OPTS="-XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:PermSize=256M -XX:MaxPermSize=512M"

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To summarise the fix: edit or create the file `~/.sbtconfig` and add the line: SBT_OPTS="-XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:PermSize=256M -XX:MaxPermSize=512M"