Load PDF from documents directory - iPhone

Question

Instead of loading a PDF from the resources folder I would like to load it from the documents directory. I have been trying to do this for days but the CGPDFDocumentRef keeps returning NULL. Here is my code:

                // Get Documents Directory 
                NSArray *searchPaths = 
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
NSUserDomainMask, YES); 
                NSString *documentsDirectoryPath = [searchPaths objectAtIndex:0]; 
                NSString *tempPath = [documentsDirectoryPath 
stringByAppendingPathComponent:[appDelegate.issueToLoad 
stringByAppendingPathExtension:@"pdf"]]; 
                NSString *path = [tempPath 
stringByReplacingOccurrencesOfString:@"localhost/" withString:@""]; 
                NSLog(@"PATH: %@", path); 
                //Display PDF 
                CFURLRef pdfURL = CFURLCreateWithFileSystemPath (NULL, 
(CFStringRef)path, kCFURLPOSIXPathStyle, FALSE); 
                NSLog(@"PDF URL: %@", pdfURL); 
                pdf = CGPDFDocumentCreateWithURL(finalURL); 
                NSLog(@"PDF: %@", pdf); 

The file path is correct and I have checked the simulator documents directory and the file is definitely there. When I run the app the last NSLog says (NULL) and a blank white page PDF is displayed. Any ideas what is wrong? Thanks!