Databases saved as *.pswx files are outdated and have not been recommended for several years now. Thus, the new Android app does not support this outdated file format anymore since version 12.1 and higher.
If you are using a *.pswx file on your Android device, you will not be able to open it with the latest Android editions.
However, in order to still have access to your data, please copy your *.pswx file to your computer. Next, open it with the Password Depot desktop program and save it as *.pswe format using the program menu Database -> Save as. Transfer this *.pswe database back to your Android device and open it with the Android app.