Plugin 'OnlineSubsystemPlayFab' failed to load because module 'OnlineSubsystemPlayFab' could not be loaded.

[yutigi]

Hi PlayFab dev team,
I encountered the error on Unreal Engine 5.5.4.

Error: Plugin 'OnlineSubsystemPlayFab' failed to load because module 'OnlineSubsystemPlayFab' could not be loaded. There may be an operating system error or the module may not be properly set up.

I finished setting up by following the document quickstart

I'm mainly focusing on the Windows platform.
I also follow the document to troubleshoot.
I can't find the path Engine\Platforms\GDK\Plugins\Online\OnlineSubsystemGDK\ in my computer.

[yuehanlin]

Hello, thank you for reaching out!

Regarding the error — after cloning the repository, could you please check whether the plugin is named OnlineSubsystemPlayFab, as shown in this documentation?

Also, could you please provide more context? Are you seeing this error when trying to build the plugin with the UE Editor, or when using it in the game? If it's in the game, try searching the UE Editor build log for the keyword "PlayFab" — does it show that the plugin was already built with the editor?

Regarding your last question about OnlineSubsystemGDK: this is likely missing because the source code you’re using comes from a public resource (e.g., GitHub), which doesn’t include platform-specific code. If you're interested in accessing the Unreal Engine GDK code, you can follow the instructions in this Microsoft GDK doc. Since you mentioned that you're primarily targeting Windows (and this plugin supports Steam on Windows), you likely don’t need access to the Unreal Engine GDK code unless you plan to support Xbox or WinGDK.

[yutigi]

Hi, thank you for your assistance.

I checked the plugin named OnlineSubsystemPlayFab that you mentioned, but I am still encountering the same issue.

The error message appears when I attempt to build the plugin with the Unreal Engine Editor. I have tried both Visual Studio and Rider for building, but the result is the same.

[yuehanlin]

I see, thank you for your information! Just to confirm — you've run the step "Run GenerateProjectFiles.bat to create project files for the engine" so that the UE5.sln file is updated, as mentioned here?

And just so I understand correctly, are you seeing this error when opening the Visual Studio solution, when trying to build the UE Editor for the Win64 platform, or after successfully building the UE Editor and then opening UE?

Could you also try searching for "PlayFab" in the Visual Studio UE Editor build log — does it show that the plugin was already built with the editor?

[yutigi]

Hi, thank you for keep helping.

Normally, I run GenerateProjectFiles by right-clicking the .uproject

I also delete these folders before running the generate project files -> Binaries, Intermediate, and Saved

This is my configuration.

I've also tried both config DebugGame and Development. The results are still the same.

After I look at the build log in the project\Saved\Logs, as you mentioned.
I found this message error. I thought they would be helpful.
LogWindows: Missing import: PlayFabMultiplayerWin.dll
LogOnline: Warning: OSS: TryLoadSubsystemAndSetDefault: LoadSubsystemModule([PlayFab]) failed

[yuehanlin]

Got it! I think the log now provides more useful hints. The message "Missing import: PlayFabMultiplayerWin.dll" makes me wonder — did you clone the repo using Git, or did you download it as a ZIP file? Downloading the ZIP might lead to corrupted binaries. We recommend using Git LFS for this reason.

One thing that’s a bit unclear to me: when you mention “right-clicking the .uproject,” are you now trying to build a game and have already passed the UE Editor build? I was under the impression that you saw this error when building the plugin with the Unreal Engine Editor — as you mentioned, "The error message appears when I attempt to build the plugin with the Unreal Engine Editor."

Or are you trying to build the plugin inside the game project without building the UE Editor first? The plugin should be built with the UE Editor first. Once that’s done, you can enable it in your game’s .uproject and then generate the Visual Studio project files from the engine you just built.

Please let me know if you still encounter this error - happy to help!

[kostenarov]

Hello. I am having the same exact problem. I cloned the repository into the Plugins folder. The build through Visual Studio completes but the module does not load.

[madon998]

Hi PlayFab dev team, I encountered the error on Unreal Engine 5.5.4.

Error: Plugin 'OnlineSubsystemPlayFab' failed to load because module 'OnlineSubsystemPlayFab' could not be loaded. There may be an operating system error or the module may not be properly set up.

I finished setting up by following the document quickstart

I'm mainly focusing on the Windows platform. I also follow the document to troubleshoot. I can't find the path Engine\Platforms\GDK\Plugins\Online\OnlineSubsystemGDK\ in my computer.

[ExoriumYTB]

I've got the same error but I think we need to build unreal engine from source.

[SAM2WOW]

Our team also received this same error, and after trying different ways of downloading the binary and compiling it, it still wouldn't work.