What does "still could not load module" mean?

[Mike Hearn]

For example:

err:module:NE_LoadBuiltinModule loaded .so but dll winealsa.drv still not
found

warn:winmm:MMDRV_Install Couldn't open driver 'winealsa.drv'

I've seen this error many times (for lots of different cases), but cannot
figure out what it means, nor what causes it. Anybody got ideas?