Got Error Domain=NSCocoaErrorDomain Code=3840 "Garbage at end.

[shinnguyen5589]

I encode with jsonString below successful but I got the error Error Domain=NSCocoaErrorDomain Code=3840 "Garbage at end." UserInfo={NSDebugDescription=Garbage at end.} when I decode it back.

{"acc":[{"user_id":"u_1","deps":[{"metadata":"""","id":"p_1","docs":[],"name":"Shin"}]}]}