Latex wont compile my master thesis anymore

Question

Two years ago, i wrote my masterthesis is Latex (Win10, MikText, Texniccenter). It worked perfectly.

Since two days, i needed this thesis again, tried to build it via Texniccenter, and it does not do anything. Pdflatex was not even able to find png-files. I never had this problem before.

Here is the ouput of Miktex:

First few lines:

This is pdfTeX, Version 3.14159265-2.6-1.40.20 (MiKTeX 2.9.7050 64-bit)
entering extended mode
(C:/Users/ASUS/Desktop/Masterthesis/Masterthesis.tex
LaTeX2e <2018-12-01>
(C:\MikTex\tex/latex/koma-script\scrreprt.cls
Document Class: scrreprt 2019/02/01 v3.26b KOMA-Script document class (report)
(C:\MikTex\tex/latex/koma-script\scrkbase.sty
(C:\MikTex\tex/latex/koma-script\scrbase.sty
...

Error message:

...
(C:\MikTex\tex/latex/complexity\complexity.sty
(C:\MikTex\tex/latex/complexity\mycomplexity.sty))
(C:\MikTex\tex/latex/colortbl\colortbl.sty (C:\MikTex\tex/latex/tools\array.sty
)) (C:\MikTex\tex/latex/tools\tabularx.sty) (C:\MikTex\tex/latex/url\url.sty)
(Masterthesis.aux) (C:\MikTex\tex/latex/psnfss\ot1ptm.fd)
*geometry* driver: auto-detecting
*geometry* detected driver: dvips

LaTeX Warning: File `image.png' not found on input line 135.


! LaTeX Error: File `image.png' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.135 ...raphics[width=1\textwidth]{image.png}

Of course image.png is still in the same directory of the tex-file.

Can anybody help me?

Thanks Alex