Error in function QFList when calling

[Marco-Israel]

My vim setting: set completeopt=menuone,popup,longest set previewpopup=height:10,width:60

According to #23 I also set like let g:quickr_preview_position = 'popup'

Here my error (true in german .., sorry :( ) output when calling \leader space. || Fehler beim Ausführen von "function QFList": || Zeile 32: || E441: Es gibt kein Vorschaufenster || Zeile 44: || E366: Popup-Fenster zu betreten nicht erlaubt

[Marco-Israel]

uncomment out set previewpopup=height:10,width:60

will resolve the error but popup does not work