If value was defined in inherited class as protected[scope], "Not found: value x" error occurs.

To reproduce it, first create Foo.scala

package a

class Foo {
  protected[Foo] var x = 0
}

and then Bar.scala:

package b

class Bar extends a.Foo {
  println(x) // Error: Not found: value x
}

Eclipse telling us, there is an error (in fact it isn't an error). After cleaning a project this error disappears.