There were some path changes to the modules etc.. due to the new work done on 0.1.5. This could be as simple as a path issue. I would do the following:
1) Remove (un-install) the mod friendslist from the joomla admin.
2) Go to the modules dir and verify that the folder has been deleted
3) Reinstall module making sure you are choosing the module from the new 0.1.5 extracted directories. 0.1.4 will most likely have issues with 0.1.5 due to the changes. Both friends and grid status modules need the latest updates 0.1.5 to work right.
Other than this, I cannot think of anything else at the moment that would pose it. Usually path or config issues.
Line 69 $this->_os_db->setQuery($query[\'friends\']);
Module is working on this end. However, I\'m not on windows so there might be something else in the installation posing the problem.