Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString objectForKey:] - objective-c

Question

My XML response:
{
"S:Envelope" = {
"S:Body" = {
"ns2:getMatchListResponse" = {
item = (
{
answerTime = {
text = 30;
};
challengerAppealsGranted = {
text = "0 of 16";
};
challengerHandle = {
text = manish;
};
challengerMatchesPlayed = {
text = 93;
};
challengerPic = {
text = "image.png";
};
challengerScore = {
text = 0;
};
challengerlosses = {
text = 0;
};
challengerwins = {
text = 4;
};
handle1 = {
text = sahni;
};
handle1AppealsGranted = {
text = 5;
};
handle1MatchesPlayed = {
text = 84;
};
handle1Response = {
text = Pending;
};
handle1Score = {
text = 0;
};
handle1losses = {
text = 0;
};
handle1wins = {
text = 1;
};
handle2MatchesPlayed = {
text = 0;
};
handle2Score = {
text = 0;
};
handle2losses = {
text = 0;
};
handle2wins = {
text = 0;
};
handle3MatchesPlayed = {
text = 0;
};
handle3Score = {
text = 0;
};
handle3losses = {
text = 0;
};
handle3wins = {
text = 0;
};
idMatch = {
text = 750;
};
isAppeal = {
text = false;
};
isFreeForm = {
text = false;
};
isMultichoiceQuestion = {
text = false;
};
isPublic = {
text = false;
};
matchName = {
text = ewtwert;
};
matchStartThresholdTime = {
text = "4 days 7 hrs";
};
matchStatus = {
text = wait;
};
matchType = {
text = Private;
};
noOfPlayers = {
text = 2;
};
priorityInList = {
text = 0;
};
scoreToWin = {
text = 5;
};
timeDuration = {
text = "5 days";
};
turnChangesIn = {
text = 0;
};
},
{
answerTime = {
text = 30;
};
challengerAppealsGranted = {
text = "0 of 16";
};
challengerHandle = {
text = manish;
};
challengerMatchesPlayed = {
text = 93;
};
challengerPic = {
text = "image.png";
};
challengerScore = {
text = 0;
};
challengerlosses = {
text = 0;
};
challengerwins = {
text = 4;
};
handle1MatchesPlayed = {
text = 0;
};
handle1Score = {
text = 0;
};
handle1losses = {
text = 0;
};
handle1wins = {
text = 0;
};
handle2MatchesPlayed = {
text = 0;
};
handle2Score = {
text = 0;
};
handle2losses = {
text = 0;
};
handle2wins = {
text = 0;
};
handle3MatchesPlayed = {
text = 0;
};
handle3Score = {
text = 0;
};
handle3losses = {
text = 0;
};
handle3wins = {
text = 0;
};
idMatch = {
text = 749;
};
isAppeal = {
text = false;
};
isFreeForm = {
text = false;
};
isMultichoiceQuestion = {
text = false;
};
isPublic = {
text = false;
};
matchName = {
text = gfhf;
};
matchStartThresholdTime = {
text = "4 days 6 hrs";
};
matchStatus = {
text = wait;
};
matchType = {
text = Public;
};
noOfPlayers = {
text = 2;
};
priorityInList = {
text = 0;
};
scoreToWin = {
text = 5;
};
timeDuration = {
text = "5 days";
};
turnChangesIn = {
text = 0;
};
}
);
"xmlns:ns2" = "http://services.tgs.com/";
};
};
"xmlns:S" = "http://schemas.xmlsoap.org/soap/envelope/";
};
}
I need value of key "matchStartThresholdTime".
I do:
NSDictionary *dictResult = [XMLReader dictionaryForXMLString:responseString error:nil];
NSDictionary *Enveloper = [dictResult objectForKey:#"S:Envelope"];
NSDictionary *Body = [Enveloper objectForKey:#"S:Body"];
NSDictionary *profileDetails = [Body objectForKey:#"ns2:getMatchListResponse"];
NSMutableArray *items = [profileDetails objectForKey:#"item"];
// NSLog(#"items===>%#",items);
NSDictionary *temp1;
for(temp1 in items)
{
thresholdTime = [NSString stringWithFormat:#"%#",[[temp1 objectForKey:#"matchStartThresholdTime"]objectForKey:#"text"]];...thresholdTime is NSString object.......and this line causes exception
//NSLog(#"time is===>%#",[[temp1 objectForKey:#"matchStartThresholdTime"]objectForKey:#"text"]);
}
What is the problem here?

Answer 1

Temp1 contains an NSString Object and not the NSDictionary, that you expect.
When dealing with JSON it is wise always to (double) check if a received object is really of the type that you expect. Always use
if ([temp1 isKindOfClass:[NSDictionary class]]) ...
or so.