Issue with GWT 2.6 + GUAVA 15

I  want to use the new feature of GWT 2.6. @GwtIncompatible GWT 2.6 annotation.

After installing 2.6.0 (RC)  and compiling the gwt proyect i get this issue  with GUAVA  ( 

• guava-15.0.jar
• guava-gwt-15.0.jar
  

[ also proved  guava -14 ]

Compiling my gwt client classes :

com/google/common/collect/super/com/google/common/collect/ImmutableSortedMap.java

     [ERROR] Line 140: Name clash: The method copyOf(Collection<? extends E>) of type ImmutableSortedSet<E> has the same erasure as copyOf(Collection<? extends E>) of type ImmutableSet<E> but does not hide it

      [ERROR] Line 145: Name clash: The method copyOf(Iterable<? extends E>) of type ImmutableSortedSet<E> has the same erasure as copyOf(Iterable<? extends E>) of type ImmutableSet<E> but does not hide it

      [ERROR] Line 150: Name clash: The method copyOf(Iterator<? extends E>) of type ImmutableSortedSet<E> has the same erasure as copyOf(Iterator<? extends E>) of type ImmutableSet<E> but does not hide it

Thank u

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