All I wanted was to use an umlaut here and there in my paper, so I loaded the above package. I still did not get a decent umlaut. Since I saw that german was popping up in places where it shouldn't have (such as Beweis instead of Proof), I deleted the include line of the package in the .tex file. But now I have an even bigger problem:
Package babel Error: Unknown language `german'. Either you have (babel) misspelled its name, it has not been installed, (babel) or you requested it in a previous run. Fix its name, (babel) install it or just rerun the file, respectively.
Now I don´t even care about the umlauts, I just want everything to go back to normal. I do not understand what I am supposed to do. I certainly do not want to reload the package.