[Gmsh] hole into a volume

[natalia lara]

hi, 
I'm trying to make a hole into a volume. The problem
is that when i use the delete command for the surface
(25) i don't get it, please, i need  somebody help me.
My file Projeto.geo is attached.

When i compile the file, appears a message with
"coplanar..." and somethings more.

i don't know if i am making something wrong, or what
other way i can use  to make it?, 

Thanks for your help,

Natalia Lara

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