I am trying to find a good Maven resource so that this question need not be asked. I have looked at Apache tutorial/POM description/Directory structure and have found all to [1] have errors, [2] not describe terms/tags, [3] to have missing terms/tags, [4] to have incomplete descriptions. The same is true for the Javageeks Maven book (Apache Maven Cookbook). So if this question seems trivial it’s because I haven’t found anything that describes Maven adequately. Helping me with this means that I won’t need to ask silly questions.

This is shown in the output window when I run a very simple code made by my neatbeans software. how to fix this error. what is the reason.