Insert the "(null)" disc to continue the installation.

I created a custom installation package for Adobe Acrobat Pro DC 2015 on Mac OS X Yosemite. It has various options turned off, such as cloud services. I built the package using a PLIST file that I got from another thread. The package creation is successful. However, when I try to install this custom package, I always get this error saying [Insert the "(null)" disc to continue the installation.]. At that point, there's nothing I can click on to close or get out of that window, and I have to eventually Force Quit the installer. What can be causing this problem? I believe I am following the instructions to the letter.