1) Rename or delete the following files on the riteSCAN Server if they exist:
C:\Program Files (x86)\riteSOFT\riteSCAN Web Service\App_Data\SystemManager.xml
C:\ProgramData\riteSOFT\SystemManager.xml (The ProgramData folder may be hidden by Windows, to find it you can change the folder settings to show hidden files or paste C:\ProgramData\riteSOFT into the address bar in File Explorer and it will bring you there.)
2) Restart the UltiDev Web Service (or IIS service if using IIS).