ObjectiveC exception thrown. Name:NSInvalidArgumentException Reason:

I am getting this error after i change some code and try to build. It doesnt pop up when i do a clean and rebuild. what can be causing this?

                    Objective-C exception thrown.  Name: NSInvalidArgumentException Reason: -[NSConcreteMutableData isEqualToString:]: unrecognized selector sent to instance 0x7dbde8b0
                    Native stack trace:
                        0   CoreFoundation                      0x0add9bf2 __exceptionPreprocess + 194
                        1   libobjc.A.dylib                     0x0b7a5e66 objc_exception_throw + 52
                        2   CoreFoundation                      0x0ae533bc -[NSObject(NSObject) doesNotRecognizeSelector:] + 172
                        3   CoreFoundation                      0x0ad584fc ___forwarding___ + 1052
                        4   CoreFoundation                      0x0ad580be _CF_forwarding_prep_0 + 14
                        5   PassPortTrial3.iOS                  0x0008f84d -[FBSDKAccessTokenCacheV4 fetchAccessToken] + 207
                        6   PassPortTrial3.iOS                  0x000793df -[FBSDKAccessTokenCache fetchAccessToken] + 77
                        7   PassPortTrial3.iOS                  0x000849af -[FBSDKApplicationDelegate application:didFinishLaunchingWithOptions:] + 97
                        8   libxamarin-debug.dylib              0x0b64df96 xamarin_dyn_objc_msgSend + 102
                        9   ???                                 0x235c7418 0x0 + 593261592
                        10  ???                                 0x235c71a8 0x0 + 593260968
                        11  ???                                 0x23104ff7 0x0 + 588271607
                        12  ???                                 0x231052f6 0x0 + 588272374
                        13  libmonosgen-2.0.dylib               0x0b1c7b9d mono_jit_runtime_invoke + 1485
                        14  libmonosgen-2.0.dylib               0x0b3a849d do_runtime_invoke + 93
                        15  libmonosgen-2.0.dylib               0x0b3a8417 mono_runtime_invoke + 231
                        16  libxamarin-debug.dylib              0x0b644372 xamarin_invoke_trampoline + 6722
                        17  libxamarin-debug.dylib              0x0b64d7cc xamarin_arch_trampoline + 156
                        18  libxamarin-debug.dylib              0x0b64de66 xamarin_i386_common_trampoline + 36
                        19  UIKit                               0x085434a7 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 296
                        20  UIKit                               0x085450ed -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4780
                        21  UIKit                               0x0854c0a4 -[UIApplication _runWithMainScene:transitionContext:completion:] + 2004
                        22  UIKit                               0x0856d7d5 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke.3129 + 53
                        23  UIKit                               0x08548cc2 -[UIApplication workspaceDidEndTransaction:] + 172
                        24  FrontBoardServices                  0x0c7141a5 __37-[FBSWorkspace clientEndTransaction:]_block_invoke_2 + 59
                        25  FrontBoardServices                  0x0c713cc5 __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 49
                        26  FrontBoardServices                  0x0c73d66c __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 23
                        27  FrontBoardServices                  0x0c73d4cd -[FBSSerialQueue _performNext] + 166
                        28  FrontBoardServices                  0x0c73d8ad -[FBSSerialQueue _performNextFromRunLoopSource] + 52
                        29  FrontBoardServices                  0x0c73ccc7 FBSSerialQueueRunLoopSourceHandler + 29
                        30  CoreFoundation                      0x0ad78edf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
                        31  CoreFoundation                      0x0ad5cfa7 __CFRunLoopDoSources0 + 519
                        32  CoreFoundation                      0x0ad5c434 __CFRunLoopRun + 1124
                        33  CoreFoundation                      0x0ad5bd5b CFRunLoopRunSpecific + 395
                        34  CoreFoundation                      0x0ad5bbbb CFRunLoopRunInMode + 123
                        35  UIKit                               0x0854733b -[UIApplication _run] + 542
                        36  UIKit                               0x0854dff3 UIApplicationMain + 148
                        37  ???                                 0x2106fce8 0x0 + 554106088
                        38  ???                                 0x2106fa70 0x0 + 554105456
                        39  ???                                 0x2106d5bc 0x0 + 554096060
                        40  ???                                 0x2106d22c 0x0 + 554095148
                        41  ???                                 0x2106d439 0x0 + 554095673
                        42  libmonosgen-2.0.dylib               0x0b1c7b9d mono_jit_runtime_invoke + 1485
                        43  libmonosgen-2.0.dylib               0x0b3a849d do_runtime_invoke + 93
                        44  libmonosgen-2.0.dylib               0x0b3abb66 do_exec_main_checked + 150
                        45  libmonosgen-2.0.dylib               0x0b3aaaf9 mono_runtime_run_main_checked + 73
                        46  libmonosgen-2.0.dylib               0x0b23ed17 mono_jit_exec + 311
                        47  libxamarin-debug.dylib              0x0b64cc24 xamarin_main + 3380
                        48  PassPortTrial3.iOS                  0x0018c601 main + 113
                        49  libdyld.dylib                       0x0c376799 start + 1

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