我使用firebase simpleLogin进行facebook登录，但似乎存在问题。我不知道如何调试这个。这里似乎有什么问题？
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from 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
)