SBT + Idea 13 => Cannot resolve symbol

问题:

I'm using SBT + Idea 13.1.1 and I have all my SBT file in red:

name := "Transformer"

version := "1.0"

libraryDependencies ++= Seq(
  "com.github.scopt" %% "scopt" % "3.2.0",
  "org.scalatest" % "scalatest_2.10" % "2.1.0" % "test"
)

It's saying "Cannot resolve symbol ..." name or version... But Seq is ok.
But it's all good to run the app from SBT cmd or even from Idea directly running the main or scalatests.

I know it's not a lot information to troubleshoot but I don't know what to check else. Tell me if you have an idea I'll provide everything.

Cheers

回答1:

To fix this, remove the folder .idea and reimport the project.

The root cause remains a mystery...

回答2:

I had a similar problem when I updated to SBT 0.13.7. IntelliJ started marking operators such as := and ++ in red with message "Cannot resolve symbol"

My steps to fix this solution were as follows:

1. In IntelliJ under Files | Settings, I switched my SBT Runner to use a Custom Launcher (and gave my path to sbt-launch.jar which for me was /opt/sbt/bin/sbt-launch.jar).

2. After testing that I can still compile after #1 above, I then had to invalidate the cache and restart; under Files | Invalidate Caches / Restart...

That's it! :-)

回答3:

I had a similar problem on 14.1.2; in my case adding

libraryDependencies += "org.scalatest" % "scalatest_2.11" % "2.2.1" % "test"

and then trying to

import org.scalatest._

Would resulted in: cannot resolve symbol scalatest

Downgrading sbt (0.13.8 -> 0.13.7); in build.properties solved the problem.

here are more details.

回答4:

Updating my build.properties from 0.13.8 to a newer version, like 0.13.15, solved it for me. Reference github issue.

回答5:

Had the same problem in IDEA 14.0. Nothing above worked.

Upgrade to IDEA 14.1.1 did the trick.

回答6:

Restarting IntelliJ fixed it for me.