Qsys fails (Error: ALTERA_HW_TCL_KEEP_TEMP_FILES)

Hi all! When i try to open my project in Qsys, i get errors: Error: System.: set ALTERA_HW_TCL_KEEP_TEMP_FILES=1 to retain temp files Error: System.: Command: C:/altera/11.1/quartus/bin/qua...