problem with debugging in java

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hi...I have problem with debugging in java...when I put a breakpoint in a method in main class..and then press "debug file" but there's an error which didn't exist yesterday...and I didn't change my project from yesterday...
the error is :

XML

Listening on javadebug
User program running
LineBreakpoint Main.java : 31 successfully submitted.
Not able to submit breakpoint MethodBreakpoint [nfa2dfa.NfaToDfa].<error> '(L<any>;)Ljava/lang/System/out/println;', reason: Method '<error>' with signature '(L<any>;)Ljava/lang/System/out/println;' does not exist in class nfa2dfa.NfaToDfa.
Breakpoint hit at line 31 in class nfa2dfa.Main by thread main.
Thread main stopped at Main.java:31.

Posted 31-Jan-12 6:02am

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Richard MacCutchan · Accepted Answer · 2012-01-31T06:15:00

Solution 1

First fix your error. The message shows that something is wrong in your class nfa2dfa.NfaToDfa which needs to be corrected before you can run this code. Try rebuilding all your classes and clear any errors that you see.

Posted 31-Jan-12 6:15am

Richard MacCutchan

Comments

[no name] 31-Jan-12 12:20pm

I pressed build and clean...and the error was gone ! thanks !