他们建议我更新scala，所以我做了：
$ scala -version
Scala code runner version 2.11.4 -- Copyright 2002-2013, LAMP/EPFL
但是这个错误仍然存在：
my_project $ sbt
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
[info] Loading project definition from /home/alex/Documents/projects/android/my_app123/sub_project1/project
[info] Compiling 1 Scala source to /home/alex/Documents/projects/android/my_app123/sub_project1/project/target/scala-2.9.2/sbt-0.12/classes...
[error] error while loading CharSequence, class file '/usr/local/java/jdk1.8.0_05/jre/lib/rt.jar(java/lang/CharSequence.class)' is broken
[error] (bad constant pool tag 15 at byte 1501)
[error] one error found
[error] (compile:compile) Compilation failed
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? q
所以错误是一样的。而且由于某种原因它在路径中有...target/scala-2.9.2/sbt-0.12/classes，为什么它使用scala 2.9.2。我尝试删除目录target，但它再次出现了相同的scala 2.9.2。
答案 0 :(得分：1)
如果使用sbt，系统上安装的Scala版本无关紧要。重要的是build.sbt文件中存在以下设置：
scalaVersion := "2.11.4"