Getting "unrecognized selector sent to instance" in code for ios8 - objective-c

Question

This code work in ios7, but I am now getting the error :
-[__NSCFString objectForKeyedSubscript:]: unrecognized selector sent to instance
.m file
//get the JSON response
NSDictionary *jsonData = [NSJSONSerialization
JSONObjectWithData:urlData
options:NSJSONReadingMutableContainers
error:&error];
//Parses the "success" value
success = [jsonData[#"success"] integerValue];
//Was it successful?
if(success){
//successful, save the profile gathered into global gMyProfile
NSArray *profileJSON=jsonData[#"myProfile"];
for (NSDictionary* dict in profileJSON)
{
NSLog(#"First_Name: %#", dict [#"first_name"]);
...
The error is happening on the NSLog statement and from a little research it is complaining about the dict[#"first_name"]);
login.py
....
#Query for user
db_cursor = db.cursor(MySQLdb.cursors.DictCursor)
db_query = """SELECT users.email, users.first_name, users.profile_pic_path, \
FROM users,data WHERE users.email='%s' \
AND users.user_id=data.user_id""" % user_email
db_cursor.execute(db_query)
#If there is one record containing the username check password
if(db_cursor.rowcount == 1):
user_profile = db_cursor.fetchone()
...
json_obj= {'success': 1, 'myProfile': user_profile,}
...
JSON Output:
{'myProfile': {'first_name': 'Matt', 'email': 'matt#email.com', 'profile_pic_path': 'default'}, 'success': 1}
All this code was working, I have not changed anything.
Any help will be greatly appreciated!!!!

Answer 1

dict is not a dictionary. It is a string. Print it and you'll know which string it is.
More likely than not, your JSON is not what you think it is. In particular, the myProfile value is a string instead of a dictionary.
What happens if fetchone() returns None; do you end up with a string in your JSON?

Answer 2

Changed in the .m
//Was it successful?
if(success){
//successful, save the profile gathered into global gMyProfile
NSArray *profileJSON=jsonData[#"myProfile"];
for (NSDictionary* dict in profileJSON)
{
...
to
//Was it successful?
if(success){
//successful, save the profile gathered into global gMyProfile
NSDictionary* dict=jsonData[#"myProfile"];
//no more for loop
...
The python JSON module returns a single dictionary instead of an array of a single dictionary when there is one element. If there are multiple it returns an array of dictionaries.
Still don't know why this didn't give me trouble in ios7 but did in ios8.