about niosii IDE debug

When I use niosII ide debug program,there is error, i can't find out where cause this problem,can anybody tell me?

The error is:

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The execution of program is suspended because of error.

Warning:

Cannot insert breakpoint 1.

Error accessing memory address 0x200378: (undocumented errno -1).

The same program may be running in another process.

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thanks!