Index does not exist;index=testindex (Errorcode 2007) (BUG ?)

I created an Index called "MyIndex" to handle some documents and I created some UI components to build my own Search Interface. I built a Component Set and an Option Set (CM -> User Interface -> Search).

The Option Set is configured to use MyIndex (Search Index IDs (csv): MyIndex).

My search Iview is configured to use my Component and my Option Set, but when I try to use the search, I get this error:

AbstractTrexIndex.getLanguagesOfIndexedDocuments: Index does not exist;index=testindex (Errorcode 2007)

I can´t understand why I get this error since there isn´t any configuration pointing to this "testindex". In the system there´s an index called "testIndex".

Any ideia?

Thanks

Vitor Zaninotto