How could I fix the error message Resolution is not supported?

1. Video Sources & Resolution
Ensure the input source is with a standard HDMI 2.0 interface to connect to your capture card. If the video source is other than a game console, there may be compatibility issue. If it is an iPhone, please use an Adapter made by Apple. If it is an iPad, connect power adaptor to the Apple USB-C Digital AV Adapter during usage.
 
Further, check if the resolution and frame rate of the video source’s setting is supported by your capture card
 
2. HDMI Cable: 
If your capture card device appears in Device Manager:
Make sure the HDMI cable is connected from the video source to the capture device's HDMI In, not HDMI Out. 
Check if swapping with a known good HDMI cable can fix an issue like this. 
We do not recommend connecting the capture device through splitters or adapters, as this may cause compatibility issues.

3 Resolution Not Support: 
Make sure the HDMI source supported by your capture card, and customize same resolution and FPS in the software with the HDMI input source.