[Roy Dennis]

If you pasted your original Songs.mbd file into your Hoster folder it will only work if the path followed in your new computer was the same path and drive letters in your old system.

Noting your previous posts this installation is on a new computer as well as an upgrade to Hoster 5.02 therefore I would think it needs to be told where all your files are located.

Open your Tools/Build songs Database/Choose build Database, in the dialog that opens in the bottom left window should be a list of all the folders where you store your music. If the correct folders are showing then press the Rebuild database button.
If there are no folders showing in the list below the Add folders button, either use the Add Folders button or the Add folders/Subfolders button if you have them in sub folders and navigate to the folders and select.
If you do this right Hoster will scan these folders for any existing KMA or KMH files and build a new data base with your files in.
If there are any folders in this list that are the wrong file path use the exclude button.
You can tell which files are in a folder in this list by highlighting the folder and it will show the contents in the right hand panel.