latex file wont compile if I add bib file but will compile same file without it

Question

My code won't compile with my jobname.bib file. It says Biber reported the following issues (biblatex) with 'UniEconomicSocialCouncil2009': (biblatex) - Entry 'UniEconomicSocialCouncil2009' (textest.bib): Invalid format '2009' of date field 'date' - ignoring. However it will compile file without it. I asked a question here Citation 'xxx' on pg 'xx' undefined on input line 'xx'; empty bibliography on input line ; there were undefined references and answer I accepted gave me some settings to put into my VSCode LaTeX workshop setup to make it work (pdflatex + biblatex + pdfLateX x 2). It worked initially. Now it does not work. This is strange because I have not changed anything in the bib file. I singled out one for the purpose tests. Now it has issues with the date as well.

\documentclass{article}
\usepackage[style=authoryear-comp]{biblatex}
\addbibresource{\jobname.bib}
\begin{filecontents}{\jobname.bib}
   @InProceedings{UniEconomicSocialCouncil2009,
   author      = {{United Nations. Economic Commission for Africa} and {United Nations. Economic and Social Council}},
   title       = {The transport situaiton in {A}frica},
   publisher   = {UN. ECA},
   date        = {2009},
   eventdate   = {2009-10-13/2009-10-15},
   eventtitle  = {UN. ECA committee on Trade, Regional Cooperation and Integration (6th Session: 2009, Oct. 13-15: Addis Ababa, Ethiopia)},
   location    = {Addis Ababa, Ethiopia},
   shortauthor = {UNECA and UNESC},
   url         = {http://hdl.handle.net/10855/3252},
  }
\end{filecontents}
\begin{document}
\cite{UniEconomicSocialCouncil2009}
\printbibliography
\end{document}