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I answer to this question in order to help other people who are struggling with this problem.

It came out that it was caused by a mismatch between Intellij Idea's scala version and server's one.

Server had scala ~ 2.11.6 while the IDE was using scala ~ 2.11.8.

In order to make sure of using the very same version, it was necessary to change IDE's scala version by doing the following steps:

File > Project Structure > + > Scala SDK > Find and select server's scala Version > Download it if you haven't it already installed > Ok > Apply > Ok


Could this be a typo? The errormessage reports 8990, in your connect config you have port 8090 for spark.

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