ios - Function signature (NSError?) -> () is not compatible with expected type (error:NSError?) -> Void? -

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![function signature (nserror?) -> () not compatible expected type (error:nserror?) -> void?]

is error keep receiving while trying build in xcode 6.4, error arises on self.follow "(user, completionhandler"

    func signin(email:string, password:string) {     pfuser.loginwithusernameinbackground(email, password: password) {         (user: pfuser?, error: nserror?) -> void in          if (user != nil)         {             var tabbarcontroller = tabbarcontroller()             self.navigationcontroller?.pushviewcontroller(tabbarcontroller, animated: true)          }         else         {             println("sign in failure! alert user!")         }      } }  func signup(email:string, password:string) {     var user = pfuser()     user.username = email     user.email = email     user.password = password      user.signupinbackgroundwithblock {         (succeeded: bool, error: nserror?) -> void in          if error !== nil         {             self.follow(user, completionhandler: {                 (error) -> () in                  if error == nil                 {                     var tabbarcontroller = tabbarcontroller()                     self.navigationcontroller?.pushviewcontroller(tabbarcontroller, animated: true)                 }             })          }         else         {             println("sign failure! alert user!")          }      } }  func follow(user: pfuser!, completionhandler:(error: nserror?) -> void?){  }

try unwrapping ?

add ! mark error this

self.follow(user, completionhandler: {             (error!) -> () in

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