Github user arthare commented on the issue:
https://github.com/apache/incubator-predictionio/issues/293
@infoquestsolutions
@jozsefhabit
Managed to fix the SimilarProduct template.
built.sbt needed to be modified to:
```
import AssemblyKeys._
assemblySettings
name := "template-scala-parallel-similarproduct"
organization := "io.prediction"
parallelExecution in Test := false
test in assembly := {}
libraryDependencies ++= Seq(
"org.apache.predictionio" %% "apache-predictionio-core" %
pioVersion.value % "provided",
"org.apache.spark" %% "spark-core" % "1.3.0" % "provided",
"org.apache.spark" %% "spark-mllib" % "1.3.0" % "provided",
"org.scalatest" %% "scalatest" % "2.2.1" % "test")
```
And each .scala file needed to have its `import` statements modified:
`io.prediction.controller.P2LAlgorithm` ->
`org.apache.predictionio.controller.P2LAlgorithm`
Then you should be able to `pio build` again.
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