Strange error message "Source not found"

[ppayal]

Hi,

I am using Eclipse and junit to debug a small program.

I created a simple method Method() which returns a value(e.g 5). I want to test that method with junit.

The problem is as follows :
If I try to execute the test without a breakpoint, it runs fine, however if I try to debug my testcase by putting a breakpoint it continues in the code properly and fails at the end saying :
"Source not found", The following unit is highlighted : JUnit3TestReference.run.TestExecution)

I have no clue what is wrong .. where ...

Please suggest ..

Regards,

ap.