Build error: duplicate declaration

When i try to build my project i get this error:

but i don't understand because i haven't duplicate declaration!
This is my code:

So you can see there isn't any duplicare declaration.
What is wrong?
Can you help me please?

This is a side effect of nb191.

Go into the Designer and rename any component that has a name like 'back' to include its type, like 'btnBack'.


For the future, to take a snapshot of your blocks, use App Inventor's function - right mouse click in the Blocks workspace and select from the pop-up menu:

download blocks

Ok for future i will do It. Howewer i solved renaming all components.
Thanks for all. :slightly_smiling_face:

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