ios - SimpleLogin facebook wont login -


i'm using firebase simplelogin facebook login, there seem issue. i'm not sure how debug this. seem issue here? 

*** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '*** -[__nsplaceholderdictionary initwithobjects:forkeys:count:]: attempt insert nil object objects[0]' *** first throw call stack: ( 0   corefoundation                      0x02c331e4 __exceptionpreprocess + 180 1   libobjc.a.dylib                     0x029b28e5 objc_exception_throw + 44 2   corefoundation                      0x02bf9376 -[__nsplaceholderdictionary initwithobjects:forkeys:count:] + 390 3   corefoundation                      0x02c26c29 +[nsdictionary dictionarywithobjects:forkeys:count:] + 73 4   app                                 0x000257b5 parseuserdata + 373 5   app                                 0x000982a6 __38-[loginviewcontroller actionfacebook:]_block_invoke + 358 6   app                                 0x00148647 __89-[firebasesimplelogin logintofacebookappwithid:permissions:audience:withcompletionblock:]_block_invoke245 + 83 7   app                                 0x00149068 __86-[firebasesimplelogin requestfacebookaccountwithpermissions:audience:appid:withblock:]_block_invoke + 245 8   accounts                            0x012cc91f __69-[acaccountstore requestaccesstoaccountswithtype:options:completion:]_block_invoke_2 + 85 9   libdispatch.dylib                   0x02f917b8 _dispatch_call_block_and_release + 15 10  libdispatch.dylib                   0x02fa64d0 _dispatch_client_callout + 14 11  libdispatch.dylib                   0x02f92fe0 _dispatch_async_redirect_invoke + 202 12  libdispatch.dylib                   0x02fa64d0 _dispatch_client_callout + 14 13  libdispatch.dylib                   0x02f94eb7 _dispatch_root_queue_drain + 291 14  libdispatch.dylib                   0x02f95127 _dispatch_worker_thread2 + 39 15  libsystem_pthread.dylib             0x032d5dab _pthread_wqthread + 336 16  libsystem_pthread.dylib             0x032d9cce start_wqthread + 30 )


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