Internal Server Error

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Error details:

URL: /Acts_SLs/Superseded/SUPERS_L/LiquorR02.htm

E0714-AS: Script terminated due to uncaught exception.

Method call trace
  buildPage(HttpRequest p_httpRequest, HttpResponse p_httpResponse, String
    p_title, String p_mainContent, String p_scripts? := null, String p_css? :=
    null) => String  line ScreenUtils:48
  buildAndSendPage(HttpRequest p_httpRequest, HttpResponse p_httpResponse,
    String p_title := "Home", String p_mainContent := "", String p_scripts? :=
    null, String p_css? := null, Integer p_code := 200)  line ScreenUtils:34
  serverBusyResponse(HttpRequest p_httpRequest, HttpResponse p_httpResponse)
    => String  line select_script:115
  select(HttpRequest p_httpRequest, HttpResponse p_httpResponse) => Session? 
    line select_script:92


Failed in: ScreenUtils
45: begin
46:     String server16DigitTime := localTime().toString("%Y%m%d%H%M%S");
47: 
48:     Settings settings := SessionResources::instance().getValue(SessionRe...
     ---^---
49:     String litSupportUrl := settings.value("litsupport-url");
50: 
51:     if not ?p_scripts then

caused by
E4398-AS: Cannot store null value in this variable. (Should the variable be
declared with the '?' modifier?)