Error in running Java Program

Hi,
I have a problem in running my simple java program after the installing of the JSDK.
I was able to compile my work but when I type java HelloWorld, the following error appears:
Exception in thread "main" java.lang.NoClassDefFoundError:HelloWorld.
The strange thing is I install the application in another machine and it works.
Is there anyone that can help me with this problem.
Thanks in advance.

Yes I run the java program in the same folder where the class file is reside.
I can confirm that there is no problem with the class file cause I had run it in another machine and it did work.
Thanks.

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