ios - Bug detection terminal in Swift cites variable as issue - variable doesn't exist -

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the first view controller of project crashed when segue'd view controller - not when loads. error message:

2016-01-05 20:06:33.836 collaboration[48812:1788623] -[collaboration.createaccountviewcontroller loginexisting:]: unrecognized selector sent instance 0x796cc950 2016-01-05 20:06:33.849 collaboration[48812:1788623] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[collaboration.createaccountviewcontroller loginexisting:]: unrecognized selector sent instance 0x796cc950' *** first throw call stack: (     0   corefoundation                      0x00396a14 __exceptionpreprocess + 180     1   libobjc.a.dylib                     0x022c5e02 objc_exception_throw + 50     2   corefoundation                      0x0039fd63 -[nsobject(nsobject) doesnotrecognizeselector:] + 275     3   corefoundation                      0x002dd6bd ___forwarding___ + 1037     4   corefoundation                      0x002dd28e _cf_forwarding_prep_0 + 14     5   libobjc.a.dylib                     0x022da0b5 -[nsobject performselector:withobject:withobject:] + 84     6   uikit                               0x00df7b79 -[uiapplication sendaction:to:from:forevent:] + 118     7   uikit                               0x00df7af8 -[uiapplication sendaction:totarget:fromsender:forevent:] + 64     8   uikit                               0x00f978f8 -[uicontrol sendaction:to:forevent:] + 79     9   uikit                               0x00f97c78 -[uicontrol _sendactionsforevents:withevent:] + 408     10  uikit                               0x00f96c7e -[uicontrol touchesended:withevent:] + 714     11  uikit                               0x00e74182 -[uiwindow _sendtouchesforevent:] + 1095     12  uikit                               0x00e75220 -[uiwindow sendevent:] + 1159     13  uikit                               0x00e19f93 -[uiapplication sendevent:] + 266     14  uikit                               0x00def668 _uiapplicationhandleeventqueue + 7802     15  corefoundation                      0x002b06ff __cfrunloop_is_calling_out_to_a_source0_perform_function__ + 15     16  corefoundation                      0x002a638b __cfrunloopdosources0 + 523     17  corefoundation                      0x002a57a8 __cfrunlooprun + 1032     18  corefoundation                      0x002a50e6 cfrunlooprunspecific + 470     19  corefoundation                      0x002a4efb cfrunloopruninmode + 123     20  graphicsservices                    0x07075664 gseventrunmodal + 192     21  graphicsservices                    0x070754a1 gseventrun + 104     22  uikit                               0x00df5bfa uiapplicationmain + 160     23  collaboration                       0x00085a3c main + 140     24  libdyld.dylib                       0x039bca21 start + 1     25  ???                                 0x00000001 0x0 + 1 ) libc++abi.dylib: terminating uncaught exception of type nsexception (lldb)

as can see, cites variable 'loginexisting' issue, loginexisting not variable on in of scripts (it before has since been removes). how can 'refresh' xcode forgets absent variable? have tried restarting machine , cleaning xcode have had not success.
thank help.

go storyboard that's crashing , right click yellow icon @ top of viewcontroller.

icon

after right clicking, towards bottom says "received actions" , delete of actions pertaining loginexisting method.

this 1 of many possible culprits, tends common.

edit: it's possible have property (iboutlet) connected storyboard no longer exists throw error.


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