Fails to copy writable plist file in document directory in ios8 - ios

Question

Am trying to copy a plist file which has a http url written to it from app bundle to documents directory but its getting failed only in ios8 with message "NSInternalInconsistencyException', reason: 'The operation couldn’t be completed. (Cocoa error 4.)'.'" .Its working fine in ios7.Please guide what could be the reason.
//To get the plist file path within app
-(NSString *)ogPath
{
NSString *str = [[NSBundle mainBundle] bundlePath];
str = [str stringByAppendingPathComponent:#"configUrl.plist"];
return str;
}
//To get the plist file path within documents directory
-(NSString *)documentPath
{
NSString *str = [[[NSBundle mainBundle] bundlePath] stringByDeletingLastPathComponent];
str = [str stringByAppendingFormat:#"/Documents/configUrl.plist"];
return str;
}
//to copy plist file within app to documents directory
-(void)copytheplistfile
{
NSString *plistpath = [self ogPath];
NSString *docpath = [self documentPath];
NSFileManager *file = [NSFileManager defaultManager];
BOOL fileexist = [file fileExistsAtPath:docpath];
if(!fileexist)
{
NSError *err;
BOOL copyResult=[file copyItemAtPath:plistpath toPath:docpath error:&err];
NSLog(#"error:%#",[err localizedDescription]);
if(!copyResult)
NSAssert1(0, #"Failed to create writable plist file with message '%#'.", [err localizedDescription]);
}
}

Answer 1

In iOS 8 file system layout of app containers has been changed. Applications and their content are no longer stored in one root directory.
Change your document path
-(NSString *)documentPath
{
NSString *str=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
str = [str stringByAppendingFormat:#"/configUrl.plist"];
return str;
}