iphone - Facebook error while login the facebook -

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i need post details on wall, when login facebook got following error, 

- (void)dialog:(fbdialog*)dialog didfailwitherror:(nserror *)error {     nslog(@"error message: %@", [error localizeddescription]); }      operation couldn’t completed. (nsurlerrordomain error -999.)

first time got error, next time shared perfectly. sharing using this,

[[delegate facebook] dialog:@"feed"                   andparams:params                 anddelegate:self];

how can fix error. why error occurred.

thank you.


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