AIMP instance error

Hi,

(If AIMP is not running and) when I open multiple song files with AIMP, system gives me this error:

---------------------------
AIMP Portable (PortableApps.com Launcher)
---------------------------
Another instance of AIMP Portable is starting. Please wait for it to start before launching it again.
---------------------------
Ok
---------------------------

If I open 5 mp3 files, same error message-box appears 4 times. One of the song files opening properly with AIMP. Other 4 files does not starts.

I never seen this before on any other portable program.

I delete also AIMP's DATA folder. But it does not fix the problem.

Please fix it.

Thank you!