Scala Play Json JSResultException Validation Error -

i trying pass json string other method error,

play.api.libs.json.jsresultexception: jsresultexception(errors:list((,list(validationerror(error.expected.jsstring,wrappedarray())))))

i find strange occurs randomly, don't exception , do. ideas?

here json looks

val string = {   "first_name" : {     "type" : "string",     "value" : "john"   },   "id" : {     "type" : "string",     "value" : "123456789"   },   "last_name" : {     "type" : "string",     "value" : "smith"   } } 

i read

(string \ "first_name").as[string] 

(string \ "first_name") gives jsvalue not jsstring as[string] not work.

but if need first name value can

val firstname = ((json \ "first_name") \ "value").as[string]