Netbeans IDE problem!!

when i comile a java file named DLSLecturer.java in netbeans
it has no problem
but when i run it in netbeans, the following error msgs appear while there was no problem running under dos prompt.
java.lang.NoSuchMethodError: Login.<init>(LLecturerMainInterface;)V
at DLSLecturer.main(DLSLecturer.java:24)
Exception in thread "main"
anybody knows why???
thanks!!!

From the very little information you have given I would assume that you have NOT mounted the correct root of your package system.
For example, if your package is
com.abc.def
based on say c:\work\src then you should mount c:\work\src and your DLSLecturer source file should be in directory c:\work\src\com\abc\def and should have package statement
package com.abc.def;

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