Steps to reproduce :

- import the Playmaker package from the Asset Store and notice the errors.

error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/es-ES/PlayMakerEditor.es-ES.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 assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/fr/PlayMakerEditor.fr.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 assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/it/PlayMakerEditor.it.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 assembly
Assets/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 assembly
Assets/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 assembly
Assets/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 assembly
Assets/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 assembly
Assets/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 assembly
Assets/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)

Compilation failed: 9 error(s), 0 warnings

*Note :
Regression from 5.4.