Expected to find a type to be declared in module rules named 'FFXShared' in 'UE5Rules'. (UE5.6.1)

Hello, i want to implement the newest FSR4 plugin into my game.

The plugin works but i sadly cannot compile my game’s source code anymore with the plugin installed.

I’m using UE5.6.1 and Rider, the current compilation error is this:

Exception while creating build target for Project: Expecting to find a type to be declared in a module rules named 'FFXShared' in 'UE5Rules, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.  This type must derive from the 'ModuleRules' type defined by UnrealBuildTool.
Exception while creating build target for UnrealEditor: System.ArgumentNullException: Value cannot be null. (Parameter 'element')
   at System.ArgumentNullException.Throw(String paramName)
   at System.Attribute.GetCustomAttributes(MemberInfo element, Type attributeType, Boolean inherit)
   at System.Reflection.CustomAttributeExtensions.GetCustomAttributes[T](MemberInfo element)
   at UnrealBuildTool.ModuleRules.IsValidForTarget(Type moduleType, ReadOnlyTargetRules targetRules, String& invalidReason)
   at UnrealBuildTool.UEBuildTarget.AddAllValidModulesToTarget(ILogger Logger)
   at UnrealBuildTool.UEBuildTarget.PreBuildSetup(ILogger Logger)
   at UnrealBuildTool.UEBuildTarget.Create(TargetDescriptor Descriptor, Boolean bSkipRulesCompile, Boolean bForceRulesCompile, Boolean bUsePrecompiled, UnrealIntermediateEnvironment IntermediateEnvironment, ILogger Logger)
   at UnrealBuildTool.ProjectFileGenerator.<>c__DisplayClass93_2.<GenerateIntelliSenseData>b__2(Tuple`2 Item)

Everything looks alright in the .uplugin files and Build.cs from FSR4.
The plugin is installed into ‘Engine/Plugins’.
I tried re-generating my project with Binaries, Intermediate and Saved folders deleted but no success.

Searched the forums and google, found nothing related.

Really clueless about this, do i need to go back to 5.6.0 maybe?

Resolved.

UE5.1> expects third-party plugins to reside in “Engine/Plugins/Marketplace” now.