Pls Help! Got a lot of errors in OnlineSubsystemModule.h

Development Programming & Scripting C++
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Hi I am A Blueprint Developer and trying to get Face book authentication working with Game Sparks and was following This. and it shows like 17 errors
I created a actor component c++ class inside of ue4 and pasted the code that they gave on the website both on my custom c++ class .cpp and .h and it did not work and when i was trying to PIE it crashed the PIE Window When I closed UE4 and opened it it did not work and it said try rebuilding from source manually what should I do

PLS Help

Output Logs: Output Log - Pastebin.com

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I have slight understanding of C++ Code

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If you would need

Picture of the errors : Share - Google Drive

My code(Just to see whether There is a problem with my code) : Code - Pastebin.com

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I Deleted the FBAPIComponent and still 25 errors and 31 in intellisense

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It appears there is a typo in the code (from your code link):

ONLINESUBSYSTEM_API "bool DoesInstanceExist(const FName InSubsystemName) const;
--------------------------^
Usually one or two errors create hundreds of compound errors.

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It seems like Intellisense is causing the problem because in the error list when I select Build only it shows 23 errors, Intellisense only there it is showing 4500 errors

And You said I made a typo in my code. where??

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Severity Code Description Project File Line Suppression State
Error C2039 ‘IsOnlineSubsystemLoaded’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 248
Error C2059 syntax error: ‘string’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C2238 unexpected token(s) preceding ‘;’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 162
Error C2039 ‘DoesInstanceExist’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 233
Error C2039 ‘IsOnlineSubsystemLoaded’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 248
Error C2059 syntax error: ‘string’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C2238 unexpected token(s) preceding ‘;’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 162
Error C2039 ‘DoesInstanceExist’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 233
Error C2039 ‘IsOnlineSubsystemLoaded’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 248
Error C2059 syntax error: ‘string’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C2238 unexpected token(s) preceding ‘;’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 162
Error C2039 ‘DoesInstanceExist’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 233
Error C2039 ‘IsOnlineSubsystemLoaded’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 248
Error C1083 Cannot open include file: ‘OnlineSubsystemFacebook.h’: No such file or directory Traitors D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Source\Traitors\FBAPIComponent.h 7
Error C1083 Cannot open include file: ‘OnlineSubsystemFacebook.h’: No such file or directory Traitors D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Source\Traitors\FBAPIComponent.h 7
Error C2059 syntax error: ‘string’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C2238 unexpected token(s) preceding ‘;’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 162
Error C2039 ‘DoesInstanceExist’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 233
Error C2039 ‘IsOnlineSubsystemLoaded’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 248
Error C2059 syntax error: ‘string’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C2238 unexpected token(s) preceding ‘;’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 162
Error C2039 ‘DoesInstanceExist’: is not a member of ‘FOnlineSubsystemModule’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystem.h 233
Error MSB3073 The command D:\Epic Games\UE_4.25\Engine\Build\BatchFiles\Rebuild.bat TraitorsEditor Win64 Development -Project=D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Traitors.uproject -WaitMutex -FromMsBuild exited with code -1. Traitors C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets 55
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All my current errors

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ONLINESUBSYSTEM_API "bool DoesInstanceExist(const FName InSubsystemName) const;
--------------------------^

There is a quotation after the ONLINESUBSYSTEM_API, in front of the bool. If this happens, it will think everything after it is a string literal. Do you have an “unterminated string constant” error somewhere?

Also, that uppercase macro thing (ONLINESUBSYSTEM_API) that comes before your functions has to have a definition somewhere:

Screenshot 2021-04-27 025014
Screenshot 2021-04-27 0250141052×421 18.6 KB

If there’s no definition, that will also cause an error. Check if ONLINESUBSYSTEM_API is defined, and if it isn’t, try replacing all occurrences of it with the one that comes with your project. This should be TRAITORS_API (assuming that’s the name of your project from the build error).

1 Like
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No this does not come with my project it comes with unreal engine [D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h] and I did not get the error “unterminated string constant”

Thanks for helping Me

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Yes the MACRO ONLINESUBSYSTEM_API is defined it is also purple in my code

I did not get the error “unterminated string constant”, but i got (syntax error ‘string’ on the same line)

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Removed both the quotations in the front and the back
Now rebuilding

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will update when completed

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I might not be surprised if the error came from my code but it is coming from unreal engine’s official code

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Can you like create a new project and add the FBAPIcomponent as said in the website Here ( the tutorial I followed) and rebuild it and check if you are experiencing any errors

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buildcs
buildcs1173×670 35.2 KB

One more thing… did you make sure to include the OnlineSubsystem in your build.cs file? (Pictured above.)
If not, try uncommenting that line with “OnlineSubsystem”.

2 Likes
17

Thanks it reduced to 3 errors

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Severity Code Description Project File Line Suppression State
Error MSB3073 The command D:\Epic Games\UE_4.25\Engine\Build\BatchFiles\Rebuild.bat TraitorsEditor Win64 Development -Project=D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Traitors.uproject -WaitMutex -FromMsBuild exited with code -1. Traitors C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets 55
Error C1083 Cannot open include file: ‘OnlineSubsystemFacebook.h’: No such file or directory Traitors D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Source\Traitors\FBAPIComponent.h 7
Error C1083 Cannot open include file: ‘OnlineSubsystemFacebook.h’: No such file or directory Traitors D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Source\Traitors\FBAPIComponent.h 7
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Now 3 build errors and 10 intellisense errors

Thanks

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Severity Code Description Project File Line Suppression State
Error C3646 ‘EnumerateOnlineSubsystems’: unknown override specifier Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error Unable to delete D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Intermediate\Build\Win64\TraitorsEditor\Development (Unable to delete \?\D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Intermediate\Build\Win64\TraitorsEditor\Development\Engine\SharedPCH.Engine.ShadowErrors.h) Traitors D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Intermediate\ProjectFiles\UnrealBuildTool 1
Error C2144 syntax error: ‘bool’ should be preceded by ‘;’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C4430 missing type specifier - int assumed. Note: C++ does not support default-int Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C3646 ‘EnumerateOnlineSubsystems’: unknown override specifier Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C2065 ‘EnumCb’: undeclared identifier Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C2275 ‘FOnlineSubsystemModule::FEnumerateOnlineSubsystemCb’: illegal use of this type as an expression Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C2096 ‘ONLINESUBSYSTEM_API’: A data member cannot be initialized with a parenthesized initializer Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C2182 ‘ONLINESUBSYSTEM_API’: illegal use of type ‘void’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C1903 unable to recover from previous error(s); stopping compilation Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C2144 syntax error: ‘bool’ should be preceded by ‘;’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C4430 missing type specifier - int assumed. Note: C++ does not support default-int Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 155
Error C2065 ‘EnumCb’: undeclared identifier Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C2275 ‘FOnlineSubsystemModule::FEnumerateOnlineSubsystemCb’: illegal use of this type as an expression Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C2096 ‘ONLINESUBSYSTEM_API’: A data member cannot be initialized with a parenthesized initializer Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C2182 ‘ONLINESUBSYSTEM_API’: illegal use of type ‘void’ Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error C1903 unable to recover from previous error(s); stopping compilation Traitors D:\Epic Games\UE_4.25\Engine\Plugins\Online\OnlineSubsystem\Source\Public\OnlineSubsystemModule.h 181
Error MSB3073 The command D:\Epic Games\UE_4.25\Engine\Build\BatchFiles\Rebuild.bat TraitorsEditor Win64 Development -Project=D:\Game Development\Unreal Engine 4\UE4 Projects\Traitors\Traitors.uproject -WaitMutex -FromMsBuild exited with code -1. Traitors C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets 55