fatal error #1061: Can't open input file ''.

[Paddy82]

Evertyime i compile and link my project, i get this error message:

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Erzeugen von lex.Beautifier.obj.
fatal error #1061: Can't open input file ''.
*** Fehlercode: 1 ***


I do not know what i do wrong.

does anybody know this mistake?

--edit--
I forgot to tell, that i do not get any errors during compile. only this one linker error.
--edit--