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I had the exact same issue and the 9 errors were coming from multiple PlayMakerEditorResources.XXX.dll with different localization. Go to Assets/PlayMaker/Editor/ where PlayMakerEditorResources.dll is located and delete all other folders such as de, fr, etc. This cleared the errors for me.
itorResources.resources' has already been imported. Consider removing one of the references or sign the assemblyAssets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)Assets/PlayMaker/Editor/ja/PlayMakerEditor.ja.resources.dll (Location of the symbol related to previous error)error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assemblyAssets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)Assets/PlayMaker/Editor/nl/PlayMakerEditor.nl.resources.dll (Location of the symbol related to previous error)error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assemblyAssets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)Assets/PlayMaker/Editor/pt-BR/PlayMakerEditor.pt-BR.resources.dll (Location of the symbol related to previous error)error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assemblyAssets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)Assets/PlayMaker/Editor/sv-SE/PlayMakerEditor.sv-SE.resources.dll (Location of the symbol related to previous error)error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assemblyAssets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)Assets/PlayMaker/Editor/zh-CN/PlayMakerEditor.zh-CN.resources.dll (Location of the symbol related to previous error)error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assemblyAssets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)Assets/PlayMaker/Editor/zh-TW/PlayMakerEditor.zh-TW.resources.dll (Location of the symbol related to previous error)