If you delete the TGL.xml file in C:\users\USERNAME.quelea\bibles folder then the message should disappear.
thank you very much, ill do your advice.
it works no more pop up warning, Now im using 2020.0 version. but the problem is that there are no display on extended monitor when project it to live.
Have a look at Tools → Options → Display, and ensure that the projection window is set to the correct display (probably “Output 2” or similar.) It may be set to “None” which would mean it won’t show up.