Make sure in the .project
the scala builder comes before the wolips incremental builder.
E.g:
<?xml version="1.0" encoding="UTF-8"?> <projectDescription> <name>Slowmation</name> <comment></comment> <projects> </projects> <buildSpec> <buildCommand> <name>org.scala-ide.sdt.core.scalabuilder</name> <arguments> </arguments> </buildCommand> <buildCommand> <name>org.objectstyle.wolips.incrementalbuilder</name> <arguments> </arguments> </buildCommand> </buildSpec> <natures> <nature>org.scala-ide.sdt.core.scalanature</nature> <nature>org.eclipse.jdt.core.javanature</nature> <nature>org.objectstyle.wolips.incrementalapplicationnature</nature> </natures> </projectDescription>