Compiling scala json parser combinators (from Play framework)

gistfile1.txt

[error] /home/vagrant/wendwet/core/src/main/scala/annoteren/model/objectrollen.scala:78: overloaded method value format with alternatives:
[error]   [T(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)](w: play.api.libs.json.Writes[T(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)])(implicit r: play.api.libs.json.Reads[T(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)])play.api.libs.json.OFormat[T(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)] <and>
[error]   [T(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)](r: play.api.libs.json.Reads[T(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)])(implicit w: play.api.libs.json.Writes[T(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)])play.api.libs.json.OFormat[T(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)(in method format)] <and>
[error]   [T](implicit f: play.api.libs.json.Format[T])play.api.libs.json.OFormat[T]
[error]  cannot be applied to (play.api.libs.json.Reads[String], play.api.libs.json.Format[String])
[error]     (__ \ "naam").format(Reads.minLength[String](5), of[String]) and
[error]                   ^
[error] one error found