Could not load extension

[d3berger]

I have built hhvm locally. Ubuntu 12.04.

I am able to build the example.so file. However, when trying to run test.sh I get this error:

Uncaught exception: Could not load extension /etc/hhvm/ext/example.so: getModule() symbol not defined. (/etc/hhvm/ext/example.so: undefined symbol: _getModule)