EXC_BAD_ACCESS Code=2 when using a Singleton - iphone

Question

I have a Singleton to manage some variables I need in various places in my app. This is the singleton, called General:
#import "General.h"
static General *sharedMyManager = nil;
#implementation General
#synthesize user;
#synthesize lon;
#synthesize lat;
#synthesize car;
#synthesize firstmess;
#synthesize firstfrom;
#synthesize numcels;
#pragma mark Singleton Methods
+ (id)sharedManager {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
if (sharedMyManager == nil) {
sharedMyManager = [[self alloc] init];
}
});
return sharedMyManager;
}
- (id)init {
if (self = [super init]) {
user = [[NSString alloc] initWithString:#"vacio"];
numcels=0;
}
return self;
}
- (void)dealloc {
// Should never be called, but just here for clarity really.
}
#end
I use it in a TableView that present in screen messages of a part of my app that is a chat.
I mean, everytime the app receives or send a message, i add 1 to the var "numcels", and that is the value that numberOfRowsInSection method returns.
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
General *general = [General sharedManager];
return *(general.numcels); //It freezes here
}
The problem is, when i run the program, it freezes at the commented line, saying EXC_BAD_ACCESS code=2. I guess that the problema may be with the singleton, but don't know where it is exactly.
Any help? Thank you in advance.
-------EDIT--------
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"Hemos entrado en cellForRowAtIndexPath");
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:#"UITableViewCell"];
if(!cell){
UITableViewCell *cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"UITableViewCell"];
}
General *general = [General sharedManager];
NSString *text=general.firstmess;//it crashes now here
NSString *remite=general.firstfrom;
[[cell textLabel]setText:remite];
[[cell detailTextLabel] setText:text];
return cell;
}
And the General.h, by request:
#import <Foundation/Foundation.h>
#interface General : NSObject {
NSString *user;
double lat;
double lon;
}
#property (nonatomic, retain) NSString *user;
#property (assign, nonatomic) double lat;
#property (assign, nonatomic) double lon;
#property (assign, nonatomic) Boolean car;
#property (assign, nonatomic) NSString *firstmess;
#property (assign, nonatomic) NSString *firstfrom;
#property (assign, nonatomic) int numcels;
+ (id)sharedManager;
#end

Answer 1

It should be like the following:
return general.numcels;
numcels is an integer and you cannot apply the * operator to it.

Answer 2

After solving the first issue (thanks to the kind help of Ankit), it crashed in the line I have commented below the EDIT. I simply changed
#property (nonatomc, assign) NSString *firstmess;
to
#property (retain, nonatomic) NSString *firstmess;
And it doesn't crash anymore.
Thank you!