iOS code: Fails on other machines, but not mine with [NSFileManager copyItemAtPath:toPath:error:]: source path is nil'

Question

I'm developing with a team, using macs that were all imaged exactly the same. Using the machine on which I wrote the code, I can programmatically create and then write to a pList file. But when I use my home machine (same image) or when my teammates test the code on their machines, we crash with a [NSFileManager copyItemAtPath:toPath:error:]: source path is nil' error. In debugging, the filepath is valid. The bundle, however, in:

 NSString *bundle = [[NSBundle mainBundle]pathForResource:@"Family" ofType:@"plist"];
    [pListfileMgr copyItemAtPath:bundle toPath: pListpath error:&error];

is nil. We are using git to version control our code. We have been keeping .DS_Store and /userdata/ files out of the repo, unless I've missed something. What is going on? Here is the code, reproduced almost verbatim from here:

NSError *error;
NSArray *pListpaths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,  YES);

NSString *pListdocumentsDirectory = [pListpaths objectAtIndex:0];

NSString *pListpath = [pListdocumentsDirectory stringByAppendingPathComponent:@"Family.plist"];
NSFileManager *pListfileMgr = [NSFileManager defaultManager];

//Create a plist if it doesn't alread exist
if (![pListfileMgr fileExistsAtPath: pListpath])
{
    NSString *bundle = [[NSBundle mainBundle]pathForResource:@"Family" ofType:@"plist"];
    [pListfileMgr copyItemAtPath:bundle toPath: pListpath error:&error];
}

NSMutableDictionary *thePList = [[NSMutableDictionary alloc] initWithContentsOfFile: pListpath];

[thePList setObject:[NSString stringWithFormat:@"%@", numberOfPeopleInFamilyOfOrigin] forKey:@"famSize"];
[thePList writeToFile: pListpath atomically: YES];

Answer 1

I believe you are misinterpreting the intent of the code you've listed above.

The following block is checking for the existence of a file located at path pListpath. If a file does not exist at pListpath, it copies a file from within your bundle to pListpath.

//Create a plist if it doesn't alread exist
if (![pListfileMgr fileExistsAtPath: pListpath])
{
    NSString *bundle = [[NSBundle mainBundle]pathForResource:@"Family" ofType:@"plist"];
    [pListfileMgr copyItemAtPath:bundle toPath: pListpath error:&error];
}

That is to say, you must ship a file called Family.plist within your bundle, the intent being that this file would act as a default plist if the a plist does not already exist at path pListpath.