Cant compile any Sketch

Hi people. I'm a student from germany and loves to work with the arduino but since yesterday, I have a big problem.

Yesterday I've installed the new Arduino brackets IDE. First everything was fine and I was able to use the old development enviroment and the new brackets development enviroment.
But suddenly ( I dont know why ) I cant compile any Arduino Sketch with the original development enviroment no more.

I get the following ERROR:

avr-gcc: error: C:\Users\MYUSERNAME\AppData\Local\Temp\build2637913655229781403.tmp/core.a: No such file or directory

Fehler beim Kompilieren. ( Error during the compile)

I've tried to reinstall the Arduino IDE but it does not work -.-

Does anyone have an idea who can I fix it?

Thank you