NIOS中的Debug问题

在NIOS中写好SDCARD代码之后，运行RUN,之后又运行RUN  AS都没什么问题。因为要验证是否可以读SDCARD中的资料，所以用Debug想看看sd里面的数据。结果出现很多错误，如下：

mi_cmd_stack_list_frames: No stack.
No symbol "new" in current context.
Current language:  auto; currently asm
Current language:  auto; currently c
No symbol "board" in current context.
No symbol "the" in current context.
No symbol "IOWR_ALTERA_AVALON_PIO_DATA" in current context.
No symbol "BUTTON2" in current context.
No symbol "IORD_ALTERA_AVALON_PIO_DATA" in current context.全部提示“当前环境没有此变量”，请问这是什么原因造成的呀？？？？？？

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