Error with Music Extension Script

[nic]

I'm getting that error when I enter in any map:

GetProcAdress: Init_Winamp or Init_WinampA

I have in_umx, out_wave, winamp and win32api Dlls in the DLL folder.

I'm trying to use a .umx (Unreal Tournament) music.

When i enter in the Script Database, the selected line is that line:

@Init_Winamp = Win32API.new winamp_dll, 'Init_Winamp', %w(p p l), 'l'