UltraMixer V.3.0.4 Demo Problem

I am trying to import an MP3 file from my computer to the playlist to remix my favorite song, but every time I try to import it, I get the following error code…

Internal Error (0xc06d007e), pid=500, tid=7884

I do not know what is wrong, and I would like to actually use the software. Can anyone help me?

Please contact our support team ultramixer.com/contact.html