Upgrading the project from version 5.2 to 5.4, compilation fails.

Development Programming & Scripting C++
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My UE project is version 5.2, and now I want to upgrade it to UE5.4. However, the compilation fails, with errors indicating issues in the UE source code. I’m using a binary version of the engine, not the source code version, and there are no instances of “Canvas.h” and “BillboardComponent.h” included in my project. Here are the error messages:

12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Engine\Canvas.h(38): error C4076: "unsigned": cannot be used with type "float"
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Engine\Canvas.h(38): error C4216: non-standard extension used: long float
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Engine\Canvas.h(38): error C2208: member not defined using this type: "double"
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Engine\Canvas.h(47): error C2059: syntax error: "type"
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Engine\Canvas.h(262): error C4076: "unsigned": cannot be used with type "float"
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Engine\Canvas.h(262): error C4216: non-standard extension used: long float
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Engine\Canvas.h(445): error C4076: "unsigned": cannot be used with type "float"
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Engine\Canvas.h(445): error C4216: non-standard extension used: long float
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Components\BillboardComponent.h(36): error C4076: "unsigned": cannot be used with type "float"
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Components\BillboardComponent.h(36): error C4216: non-standard extension used: long float
12>H:\UE_5.4\Engine\Source\Runtime\Engine\Classes\Components\BillboardComponent.h(36): error C2208: member not defined using this type: "double"
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Greetings @Elvisa0023

You mentioned that you have no instances of billboard/canvas/etc. I’d ensure there are no calls anywhere that could reference them. Also, does your project include any plugins? (Plugins not updated to the new UE will pop errors as well)

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Make sure to set as startup project selecting your project

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(post deleted by author)

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i’m sure my project is startup project

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I do have some plugins. To verify if the errors are caused by plugins, I created a new empty C++ project in the UE5.4 editor and compiled it with all the plugins I use included. However, the compilation of this empty project went smoothly.

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Try to delete the folder Intermediate+DerivedCache in your project folder and redo a Generate Visual Studio files.

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Thank you for your reply. I have tried this way :smiling_face_with_tear:

1 Like
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I want to ensure I fully understand. You created a new empty project, added all of the plugins you’re currently using on your problematic project and it compiled without issue, correct?