Please check the PaperStream IP(x64) version in the control panel.
If it does not match the version supported by the PaperStream NX Manager version you are using, uninstall it and re-install it using PaperStream NX Manager installer.
|PaperStream NX Manager version||Supported PaperStream IP(x64) version|
|1.0 to 1.1||220.127.116.1173|
|1.2 to 1.3||18.104.22.16819|