iOS afnetworking Error Resolution

Error log:

error domain=nscocoaerrordomain code=3840" The operation couldn ' t be completed. (Cocoa error 3840.) " (No string key for value in object around character 22.) userinfo=0x7f7f8b015d60 {Nsdebugdescription=no string key for value in object around character.} 

 error reason: 

 server returns JSON format problem 

 workaround: 

 A. Grab packet or browser debug interface 

1. Grab Bag: 

 
 
  
 
< Span class= "S1" >sudo tcpdump-a  host 192.x.x.x  
 
tcpdump-i EN3 host 192. x.x.x  
-A plaintext display 
-i En3:en3 for Device name network interface 
 
2. Browser debugging 
 two. Online JSON format Proofing 

http://tool.oschina.net/codeformat/json JSON online format to find the problem, the server returned is mainly using single quotation marks to cause errors 

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iOS afnetworking Error Resolution