why examples doas not compile ?

[radoslawtwardy]

When i try;
val authorNames = json.extract {String} (allAuthors)
i get:

 error: could not find implicit value for evidence parameter of type cc.spray.json.lenses.package.Reader{String}

When i try:
val newJson1 = json.update(allAuthors ! set {String} ("John Doe"))
i get:

error: Cannot find JsonWriter or JsonFormat type class for String

// i must replaced [ with { because with [ i cant add properly msg

[jrudolph]

You need the import

import cc.spray.json.lenses.JsonLenses._

Have you tried that?

[radoslawtwardy]

Yes

[jrudolph]

I'm closing this, since you are the only one who ever complained about this issue and I couldn't reproduce it.

[landon9720]

OP should double check the following imports exist:

import spray.json._
import DefaultJsonProtocol._
import lenses.JsonLenses._

[Cadovvl]

adding import
import DefaultJsonProtocol._
have helped me with the same problem