allocated too much memory - iphone

Question

I try to do an app but I get a lot of crash an memory allocation, then I try to reduce all the code and clean it, now I get this e
Why I get:
Potential leak of an object allocated on line 101 and stored into 'livello'
- (id) leggiLivelloDaTabella:(NSString *)tabella {
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *databasePath = [documentsDir stringByAppendingPathComponent:#"DataBase.sqlite"];
sqlite3 *database;
Livello *livello = nil;
if (sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
// query che ricava i valori
const char *sql = [[NSString stringWithFormat:#"select * from Livelli WHERE Tabella = '%#'",tabella] UTF8String];
sqlite3_stmt *selectstmt;
if(sqlite3_prepare_v2(database, sql, -1, &selectstmt, NULL) == SQLITE_OK) {
while(sqlite3_step(selectstmt) == SQLITE_ROW) {
// ricaviamo i valori letti dalla query
NSString *nomeTabella = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 0)];
NSString *risposteGiuste = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 1)];
NSString *stato = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 2)];
NSString *risposteMinime = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 3)];
NSString *tentativiSbagliati = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 4)];
NSString *tentativiTotali = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 5)];
NSString *popUp = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 6)];
NSString *idLivello = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 7)];
livello = [[Livello alloc] initLivelloWithTabella:nomeTabella
rispGiuste:risposteGiuste
statoLivello:stato
rispMinime:risposteMinime
tentativiSbagliati:tentativiSbagliati
tentativiTot:tentativiTotali
disaplyPopUp:popUp
idLevel:idLivello];
}
}
sqlite3_finalize(selectstmt);
sqlite3_close(database);
selectstmt = nil;
}
else
sqlite3_close(database);
return livello;
}

Answer 1

If you are not using ARC (automatic reference counting), you should be marking livello as autorelease. Try using this as your return statement:
return [livello autorelease];
Here is some more info on ARC:
http://maniacdev.com/ios-5-sdk-tutorial-and-guide/arc-automatic-reference-counting/
http://longweekendmobile.com/2011/09/07/objc-automatic-reference-counting-in-xcode-explained/