Bug Class RCTCxxModule was not exported. Did you forget to use RCT_EXPORT_MODULE()

[nhuthan]

Is this a bug report?

yes

Have you read the Contributing Guidelines?

yes

Environment

Environment:
OS: macOS Sierra 10.12.6
Node: 6.11.3
Yarn: 1.2.0
npm: 5.5.1
Watchman: 4.9.0
Xcode: Xcode 9.1 Build version 9B55
Android Studio: Not Found

Packages: (wanted => installed)
react: 16.0.0-beta.5 => 16.0.0-beta.5
react-native: 0.49.0 => 0.49.0

Steps to Reproduce

Everything ok until i upgrade to RN 0.49.0 (IOS only)

The first lines of ios debug console are:

2017-12-07 16:35:53.114 [info][tid:main][RCTCxxBridge.mm:187] Initializing <RCTCxxBridge: 0x1c01a62e0> (parent: <RCTBridge: 0x1c00b52a0>, executor: (null))
2017-12-07 16:35:53.122874+0700 ECRM[798:221531] Initializing <RCTCxxBridge: 0x1c01a62e0> (parent: <RCTBridge: 0x1c00b52a0>, executor: (null))
2017-12-07 16:35:53.502 [warn][tid:main][RCTBridge.m:121] Class RCTCxxModule was not exported. Did you forget to use RCT_EXPORT_MODULE()?
2017-12-07 16:35:53.502090+0700 ECRM[798:221531] Class RCTCxxModule was not exported. Did you forget to use RCT_EXPORT_MODULE()?
...

And warning on iphone (if i enable remote debug the warning not append)

Problem is

App will crash and cannot open if i run on release mode.

Log from device (iphone 6)

Incident Identifier: DB166116-57D2-4A69-AA6C-B0AFB663330D
CrashReporter Key:   a05f8f8292a52417b5f232ccb5c534d8bb308cb4
Hardware Model:      iPhone7,2
Process:             ECRM [3236]
Path:                /private/var/containers/Bundle/Application/D106B2FB-2A87-4EA5-AED2-28750E7B77B3/ECRM.app/ECRM
Identifier:          com.redsand.redsand2017
Version:             3 (2.5.1)
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           com.redsand.redsand2017 [1124]


Date/Time:           2017-12-06 12:02:32.7233 +0700
Launch Time:         2017-12-06 12:02:31.2092 +0700
OS Version:          iPhone OS 11.0.3 (15A432)
Baseband Version:    6.17.00
Report Version:      104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  5

Application Specific Information:
abort() called

Filtered syslog:
None found

Last Exception Backtrace:
0   CoreFoundation                	0x183dcbd38 __exceptionPreprocess + 124
1   libobjc.A.dylib               	0x1832e0528 objc_exception_throw + 55
2   CoreFoundation                	0x183dcbc80 +[NSException raise:format:] + 115
3   ECRM                          	0x100c4c70c 0x100b04000 + 1345292
4   ECRM                          	0x100c4a3d0 0x100b04000 + 1336272
5   CoreFoundation                	0x183dd36a0 __invoking___ + 143
6   CoreFoundation                	0x183cb2820 -[NSInvocation invoke] + 291
7   CoreFoundation                	0x183cb722c -[NSInvocation invokeWithTarget:] + 59
8   ECRM                          	0x100c5d884 0x100b04000 + 1415300
9   ECRM                          	0x100c9d5a4 0x100b04000 + 1676708
10  ECRM                          	0x100c9d304 0x100b04000 + 1676036
11  libdispatch.dylib             	0x183751088 _dispatch_call_block_and_release + 23
12  libdispatch.dylib             	0x183751048 _dispatch_client_callout + 15
13  libdispatch.dylib             	0x18375ae48 _dispatch_queue_serial_drain$VARIANT$mp + 527
14  libdispatch.dylib             	0x18375b7d8 _dispatch_queue_invoke$VARIANT$mp + 339
15  libdispatch.dylib             	0x18375c200 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 399
16  libdispatch.dylib             	0x1837644a0 _dispatch_workloop_worker_thread$VARIANT$mp + 643
17  libsystem_pthread.dylib       	0x1839f6fe0 _pthread_wqthread + 931
18  libsystem_pthread.dylib       	0x1839f6c30 start_wqthread + 3

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Maybe the issue has been fixed in a recent release, or perhaps it is not affecting a lot of people. If you think this issue should definitely remain open, please let us know why. Thank you for your contributions.

[temitope]

@nhuthan I am running into the same issue. I get the warning on Debug and it will not run the app at all upon Release. Did you find a solution?

[nhuthan]

My problem is that I have used an undefined property.
So check your code carefully

[temitope]

@nhuthan was that in your AppDelegate.m ? I am wondering why this is only happening on Release. Do you remember where the undefined property was needing to be set? (which file?)

[nhuthan]

It's just in my js files, the react component has a problem. I do not know why it crashed my app instead of throwing a warning on release

…

On Mar 3, 2018 4:41 PM, "Temitope" ***@***.***> wrote: @nhuthan <https://github.com/nhuthan> was that in your AppDelegate.m ? I am wondering why this is only happening on Release. Do you remember where the undefined property was needing to be set? (which file?) — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#17107 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AL2SHZfMsSnBBxhJQ2cxWKrgMY4fdimxks5tamU-gaJpZM4Q5RX6> .