Unable to provision, see the following errors:

1) [Guice/DuplicateElement]: Duplicate elements found in Multibinder Set<String>.

Duplicates:
1 : Element: element
    Bound at:
    1 : DuplicateElementErrorTest$DuplicateElementModule.configure(DuplicateElementErrorTest.java:37)
    2 : DuplicateElementErrorTest$DuplicateElementModule.provideFirst(DuplicateElementErrorTest.java:27)
    3 : DuplicateElementErrorTest$DuplicateElementModule.provideSecond(DuplicateElementErrorTest.java:32)

Multibinder declared at:
  DuplicateElementErrorTest$DuplicateElementModule.configure(DuplicateElementErrorTest.java:37)
      \_ installed by: DuplicateElementErrorTest$DuplicateElementModule -> RealMultibinder

Learn more:
  https://github.com/google/guice/wiki/DUPLICATE_ELEMENT

1 error

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Full classname legend:
======================
DuplicateElementErrorTest$DuplicateElementModule: "com.google.inject.errors.DuplicateElementErrorTest$DuplicateElementModule"
RealMultibinder:                                  "com.google.inject.internal.RealMultibinder"
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End of classname legend:
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