I use JabRef an TexStudio. Until yesterday it worked fine, downloaded the citation from webpages (like wiley etc.) and imported it in my jabreffile. Used \cite{ref} in Text and all was good.
By today things got wierd. I exceeded 50 entries (now 53) in my JabRef and was compilig the document as usual. All worked fine, but then a strange warning came up: “Citation ‘ref’ on page xyz undefined” This happened to ALL citations I added. Including self written, downloaded an even old ones (just changed the page for testing).
I have literally no f***n clue whats wrong… Even google was like: I have no clue either.
So guy, I need your help:
Has anyone any clues whats wrong?
Thanks in advance!
Edit 1: Forgot to say: Yes, i saved the Jabref file before compiling. And funfact: If i do \cite{}, Texstudio even DOES show the entry i’d like to use and all the properties.
Edit 2: restart does not solve the problem
Edit 3: Here is a picture of the problem: