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

[leitao]

I am having the same problem, when uncommenting the line above, I get:

Error detected while processing function QFList[29]..OpenPreviewWindow[6]..BufWinEnter Autocommands for "*"..function PreviewWindowPosition:
line    2:
"kernel/events/uprobes.c" 2439 lines --45%--
Error detected while processing function QFList:
line   32:
E441: There is no preview window
line   44:
E366: Not allowed to enter a popup window

I am using the latest vim version (from upstream source code)