habe folgenden Code geschrieben:
\documentclass[a4paper,
	twoside,							% Doppelseiten
	headsepline=true,				% Trennline zum Seitenkopf	
	footsepline=true,				% Trennline zum Seitenfuß
	headings=normal
	listof=totoc,					% Verzeichnisse im Inhaltsverzeichnis aufführen
	bibliography=totoc,			% Literaturverzeichnis im Inhaltsverzeichnis aufführen
	listof=entryprefix
]
{scrartcl}
%% Deutsche Anpassungen %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
%% Bibliographiestil %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[
	backend = biber,
	natbib  = true,
	style  = alphabetic,
	sorting = nyt
]{biblatex}
\addbibresource{Literatur}
\usepackage{csquotes}
\begin{document}
\cite{GoldsteinE.Bruce2015W:dG}
\cite{Hön2019:Farbwahrnehmung}
\cite{Hön2019:Bewegungswahrnehmung}
\cite{Schultz:Gestaltgesetze}
\newpage
\nocite{*} % adds all entries in the bib file to the bibliography
\printbibliography[nottype = online, title = Literaturverzeichnis]
\printbibliography[
	type 		= online,				% Put only references of the type "online" here.
	title		= {Online-Quellen},	%Setzt den Titel für den subbibliograpy			 
	heading	= subbibliography
]
\end{document}@book{GoldsteinE.Bruce2015W:dG,
	series = {Springer Lehrbuch},
	isbn = {9783642550737},
	year = {2015},
	title = {Wahrnehmungspsychologie: der Grundkurs},
	edition = {9. Aufl.},
	publisher = {Addison-Wesley},
	language = {ger},
	author = {Goldstein, E. Bruce},
	keywords = {Wahrnehmungspsychologie}
}
@unpublished{Hön2019:Farbwahrnehmung,
	title = {Farbwahrnehmung},
	author = {Angelika Hö},
	language = {german},
	location = Berlin,
	date = {2019-11-21},
	howpublished = Vorlesungsfolie,
	note = {Zugegriffen am: 21.11.2019}
}
@unpublished{Hön2019:Bewegungswahrnehmung,
	title = {Bewegungswahrnehmung},
	author = {Angelika Hö},
	language = {german},
	location = Berlin,
	date = {2019-11-28},
	howpublished = Vorlesungsfolie,
	note = {Zugegriffen am: 28.11.2019}
}
@online{Schultz:Gestaltgesetze,
	author = {Birgit Schultz},
	organization =  {Marketing-Zauber},
	url 	= {https://marketing-zauber.de/gestaltgesetze/},
	title = {Gestaltgesetze: Deine geheimen Zutaten für besseres Design!},
	date	= {2019-04-27},
	language = german,
	note = {Zugegriffen am: 05.12.2019},
}
LaTeX Warning: Citation 'GoldsteinE.Bruce2015W:dG' on page 1 undefined on input
 line 31.
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putenc Error: Invalid UTF-8 byte "F6}{See the inputenc package documentation fo
r explanation.}{The document does not appear to be in UTF-8 encoding.\MessageBr
eak Try adding \UseRawInputEncoding as the first line of the file\MessageBreak 
or specify an encoding such as \usepackage [latin1]{inputenc}\MessageBreak in t
he document preamble.\MessageBreak Alternatively' on page 1 undefined on input 
line 32.
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ol}n2019:Farbwahrnehmung' on page 1 undefined on input line 32.
LaTeX Warning: Citation 'H\GenericError {(inputenc)                }{Package in
putenc Error: Invalid UTF-8 byte "F6}{See the inputenc package documentation fo
r explanation.}{The document does not appear to be in UTF-8 encoding.\MessageBr
eak Try adding \UseRawInputEncoding as the first line of the file\MessageBreak 
or specify an encoding such as \usepackage [latin1]{inputenc}\MessageBreak in t
he document preamble.\MessageBreak Alternatively' on page 1 undefined on input 
line 33.
LaTeX Warning: Citation 'save the file in UTF-8 using your editor or another to
ol}n2019:Bewegungswahrnehmung' on page 1 undefined on input line 33.
LaTeX Warning: Citation 'Schultz:Gestaltgesetze' on page 1 undefined on input l
ine 34.
Overfull \hbox (2188.98663pt too wide) in paragraph at lines 31--35
[]\T1/lmr/m/n/10.95 [[]] [[];
 []
Overfull \hbox (36.15657pt too wide) in paragraph at lines 31--35
[]\T1/lmr/m/n/10.95 ]
 []
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\T1/lmr/m/n/10.95 [[];
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[]\T1/lmr/m/n/10.95 ]
 []
[1
{C:/Users/.../AppData/Local/MiKTeX/2.9/pdftex/config/pdftex.map}]
LaTeX Warning: Empty bibliography on input line 38.
Package biblatex Warning: Type 'online' not found on input line 39.
LaTeX Warning: Empty bibliography on input line 39.
(Probe.aux)
LaTeX Warning: There were undefined references.
Package biblatex Warning: Please (re)run Biber on the file:
(biblatex)                Probe
(biblatex)                and rerun LaTeX afterwards.
ich hoffe Ihr könnt mir weite helfen.
Lg
Padawan
