Hi,
Apologies for this happening. Which version of the game do you have? Do you have any songs installed on your phone?
Try installing some songs manually onto the PC client by extracting .zip files from beatsaver.com to
C:\Users\[Your username]\AppData\LocalLow\Tempstudio, LLC\Rhythm Taichi\savedsongs
It may bypass the initial song installation and allow this to work.
Tempstudio