When I start the simulation I get the error message "Error building simulation"

Here's the output without REM's:
Translation    14:06:36        0:0-0:0    Error building simulator. Buildlog: MINGW = "D:\OpenModelica1.9.0\"\MinGW
PATH = D:\OpenModelica1.9.0\MinGW\bin;D:\OpenModelica1.9.0\MinGW\bin\..\libexec\gcc\mingw32\4.4.0\; 
CD = C:\Users\esser\AppData\Local\Temp\OpenModelica\OMEdit
gcc   -falign-functions -msse2 -mfpmath=sse   -I"D:/OpenModelica1.9.0//include/omc" -I. -L"D:/OpenModelica1.9.0/lib/omlibrary/Modelica 3.1/Electrical"   -c -o Modelica.Electrical.Machines.Examples.DCEE_Start.o Modelica.Electrical.Machines.Examples.DCEE_Start.c
Das System kann den angegebenen Pfad nicht finden.
mingw32-make: *** [Modelica.Electrical.Machines.Examples.DCEE_Start.o] Error 1

What can I do? Any suggestions?

Regards, Michael