FSEventStreamCreate crashing in obj-c app - objective-c

Question

I'm trying to do file monitoring on a directory, took the code from the apple docs. Its crashing on the fseventstreamcreate function call with this error:
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000008
I'm fairly new to objective C (although I know this is C code, its part of an obj-c app) and really have no idea why this is crashing, prob a noob mistake here. I appreciate any help with this.
void monitorCallback(
ConstFSEventStreamRef streamRef,
void *clientCallBackInfo,
size_t numEvents,
void *eventPaths,
const FSEventStreamEventFlags eventFlags[],
const FSEventStreamEventId eventIds[])
{
int i;
char **paths = (char**)eventPaths;
// printf("Callback called\n");
for (i=0; i<numEvents; i++)
{
/* flags are unsigned long, IDs are uint64_t */
printf("Change %llu in %s, flags %u\n", eventIds[i], paths[i], eventFlags[i]);
}
}
- (void) monitorFolder
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSString * monitorFolder = [[NSUserDefaults standardUserDefaults] objectForKey:#"monitorFolder"];
//Create stream to monitor for changes.
CFArrayRef pathsToWatch = CFArrayCreate(NULL, (const void **)&monitorFolder, 1, NULL);
FSEventStreamRef stream;
CFAbsoluteTime latency = 3.0; /* Latency in seconds */
/* Create the stream, passing in a callback */
stream = FSEventStreamCreate(
NULL,
(FSEventStreamCallback)&monitorCallback,
NULL,
pathsToWatch,
kFSEventStreamEventIdSinceNow,
latency,
kFSEventStreamCreateFlagNone );
...
}