** Problem 1 **
"_OBJC_CLASS_$_ObjectBuilder", referenced from:
-u command line option
ld: symbol(s) not found for architecture arm64
clang : error : linker command failed with exit code 1 (use -v to see invocation)
** Solution 1 **
This is happening because ObjectBuilder is not declared into the static library, so add it in XCode.
** Problem 2 **
java exited with code 2 (more or less)
** Solution 2 ** Enable Multi-Dex