# Pastebin jO4Ea1d2
Error:
/Users/kevin/Code/Pony/json-rpc-pony/jsonrpc/test/_test_dispatcher.pony:25:17: argument not a subtype of parameter
    p.next[None]( {(r:Response val): None => h.assert_true(true)},
                ^
    Info:
    /Users/kevin/Code/Pony/json-rpc-pony/jsonrpc/test/_test_dispatcher.pony:25:17: {(Response val): None} ref is not a subtype of Fulfill[Response val, None val] iso: ref is not a subcap of iso
        p.next[None]( {(r:Response val): None => h.assert_true(true)},
                    ^
Error:
/Users/kevin/Code/Pony/json-rpc-pony/jsonrpc/test/_test_dispatcher.pony:31:24: argument not a subtype of parameter
    h.assert_eq[String](r.result, "hello bob")
                       ^
    Info:
    /usr/local/Cellar/ponyc/0.16.1/packages/json/json_type.pony:3:18: F64 val is not a subtype of String val
    type JsonType is (F64 | I64 | Bool | None | String | JsonArray | JsonObject)
                     ^
    /usr/local/Cellar/ponyc/0.16.1/packages/json/json_type.pony:3:18: not every element of (F64 val | I64 val | Bool val | None val | String val | JsonArray val | JsonObject val) is a subtype of String val
    type JsonType is (F64 | I64 | Bool | None | String | JsonArray | JsonObject)