Could you please attach the whole log file? Also, which operating system are you using and which version of SDE-NB did you try to download? We want to look further into this problem.
For now, a temporary solution is to use the no_install version which is as simple as unzipping the contents into your NetBeans directory.
Visual Paradigm folks have not really done a great job on documentation on using this tool with NetBeans, installation instructions are not clear and do not work for me as well using the installer, It bypasses the screen where it should ask for NetBeans directory.
I submitted the bug and got the reply from support that I should download the no-install zip file, and I downloaded the no install zip file and followed the instructions. The only thing I see is a thread VPUMS.exe, the question is how to integrate it with NetBeans??