NSError help

[Tom Jones]

Hello,
I'm trying to understand why I'm getting thrown in to the debugger when using 
NSError. I have three methods and I'm overloading them and trying to pass the 
NSError along the way. What am I doing wrong?

Thanks,
tom


Code:

-(NSString *)getDataForType:(NSString *)aType error:(NSError **)err
{
    NSError *localErr = nil;
    NSString *result = [self getDataForType:aType separator:@"\t" 
excludeFields:nil error:&localErr];   
    *err = *localErr;
    return result;
}

-(NSString *)getDataForType:(NSString *)aType excludeFields:(NSArray *)aFields 
error:(NSError **)err
{
    NSError *localErr = nil;
    NSString *result = [self getDataForType:aType separator:@"\t" 
excludeFields:aFields error:&localErr];
    *err = *localErr;
    return result;
}

-(NSString *)getDataForType:(NSString *)aType separator:(NSString *)aSeperator 
excludeFields:(NSArray *)aFields error:(NSError **)err
{
    BOOL isValidQuery = [self hasValidType:aType];
    if (isValidQuery == NO) {
        NSMutableDictionary *errorDetail = [NSMutableDictionary dictionary];
        [errorDetail setValue:@"Failed to find the requested type." 
forKey:NSLocalizedDescriptionKey];
        *err = [NSError errorWithDomain:@"DataForType" code:1 
userInfo:errorDetail];
        return nil;
    } else {
        err = nil;
    }
...
...
...
}

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