mentor en export HDL

我在Mentor en DA中输出HDL时出现了以下错误：

Attempt to connect failed (for child of schematic named schematic)
Attempt to connect child Design object failed (child $BASE/1/TEST/schematic/sheet1)
Design object E:/lgx/1/TEST/schematic contains a reference to $BASE/1/TEST/schematic/sheet1
Attempt to initialize object failed (name $BASE/1/TEST/schematic/sheet1)
Error opening attribute file (name $BASE/1/TEST/schematic/sheet1.mgc_sheet.attr)
Unable to find environment variable value: BASE
Couldn't open sheet
Error opening view object E:/lgx/1/TEST/schematic

请问有哪位高手这种问题的解决方法啊，急