Error When Parsing Curl Api - ios

Question

I Have implemented this code. When I run it for the first time, it gives a response. But When I Run it the Second time, it gives error like....
Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (No value.) UserInfo=0x178265540 {NSDebugDescription=No value.
But Whenever I uninstalled and rebuild it gives response.
NSMutableArray *data=[[NSMutableArray alloc]initWithObjects:#"type",#"st_eml",#"st_pwd",nil];
NSMutableArray *value=[[NSMutableArray alloc]initWithObjects:#"normal", #"Huhn",#"1234", nil];
//NSArray *keys = [[NSArray alloc ]initWithObjects:#"type", #"st_eml", #"st_pwd", nil];
//NSArray *objects = [[NSArray alloc]initWithObjects:#"normal", #"Huhn",#"123", nil];
NSDictionary *theRequestDictionary = [NSDictionary dictionaryWithObjects:value forKeys:data];
// Serialize the data
NSError *error = NULL;
NSData *theJSONData = [[CJSONSerializer serializer] serializeDictionary:theRequestDictionary error:&error];
NSLog(#"Serialization Error: %#", error);
// Change the data back to a string
NSString* theStringObject = [[NSString alloc] initWithData:theJSONData encoding:NSUTF8StringEncoding];
// Determine the length of the data
NSData *requestData = [theStringObject dataUsingEncoding:NSUTF8StringEncoding];
NSString* requestDataLengthString = [[NSString alloc] initWithFormat:#"%lu", (unsigned long)[requestData length]];
// Create request to send to web service
NSString *strurl = #"http://testing.singletreffen.de/appapi/v1/login";
NSString* webStringURL = [strurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString:webStringURL]];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:requestData];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:requestDataLengthString forHTTPHeaderField:#"Content-Length"];
[request setTimeoutInterval:30.0];
// Deserialize the response
NSData *returnData = [ NSURLConnection sendSynchronousRequest: request returningResponse: nil error:&error];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];

Answer 1

I have tried your code, made some changes in parsing and it's working properly and giving response also
NSMutableArray *data=[[NSMutableArray alloc]initWithObjects:#"type",#"st_eml",#"st_pwd",nil];
NSMutableArray *value=[[NSMutableArray alloc]initWithObjects:#"normal", #"Huhn",#"1234", nil];
NSDictionary *theRequestDictionary = [NSDictionary dictionaryWithObjects:value forKeys:data];
// Serialize the data
NSError *error = nil;
NSData *theJSONData = [NSJSONSerialization dataWithJSONObject:theRequestDictionary options:0 error:&error];
NSLog(#"Serialization Error: %#", error);
// Change the data back to a string
NSString* theStringObject = [[NSString alloc] initWithData:theJSONData encoding:NSUTF8StringEncoding];
// Determine the length of the data
NSData *requestData = [theStringObject dataUsingEncoding:NSUTF8StringEncoding];
NSString* requestDataLengthString = [[NSString alloc] initWithFormat:#"%lu", (unsigned long)[requestData length]];
// Create request to send to web service
NSString *strurl = #"http://testing.singletreffen.de/appapi/v1/login";
NSString* webStringURL = [strurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString:webStringURL]];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:requestData];
[request setHTTPBody:requestData];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:requestDataLengthString forHTTPHeaderField:#"Content-Length"];
[request setTimeoutInterval:30.0];
// Deserialize the response
NSData *returnData = [ NSURLConnection sendSynchronousRequest: request returningResponse: nil error:&error];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];
NSLog(#"LOG : %#", returnString);