Android Question [SOLVED] Compilation error - Reference to an object...

[LucaMs]

Reference to an object not set on an object instance.

[The IDE language is set to English]

 

[LucaMs]

Solved,

It was related to the package name (changed for testing) and the private sign key.

 

[Star-Dust]

Solved,
It was related to the package name (changed for testing) and the private sign key.

What does it mean?
A wrong package name or that does not like report compilation error?
A bad signature or a worse calligraphy is not filled out?

 

[LucaMs]

What does it mean?
A wrong package name or that does not like report compilation error?
A bad signature or a worse calligraphy is not filled out?

I changed the package name to maintain the same "old" app on my device (and mainly its local data); when I tried to compile, I got that error message, without other details.
Creating a new private sign key, for this new package, solved.