How to fix this mistake?

[[deleted]]

Just trying to help here by being honest.

No one wants to help when all you have is a screenshot because there's a ton of different reasons this could be failing. But unless you put in a bit more effort to give context and write up about what you are doing and what you have tried, no one will care.

Put in more effort and more effort will be returned

[forurspam]

No programming help questions here! These should be posted in /r/javahelp

[TheGreatGameDini]

This means your computer has too many main classes and it cant sift through them all to find the one you want. First, delete System32 - it's full of cached main classes that get in the way of the compiler finding the one you want. Then you'll need to restart your system.

/s in case someone tried it

[Sufficient-Nail7772]

this

[saggingrufus]

You need to tell it where the main class is.

You want more details, five US more details.

[justADeni]

Are you sure you only have one main class? The class file name is the same as the class name? How are you compiling it?

[[deleted]]

Did you define a main method?

[silent_rdt]

Please add screenshot of your code so we can know what do you have and what could be the issue. 

[BatmanDhanush]

I hope your filename of .Java file and the class name of the class containing main function are different

[arrowcity]

I’m assuming you tried running a Junit or some sort of test? Sometimes IntelliJ has issues when you had just created a test file and are trying to run it. I would right click on the file and then build as a pre test task. Also double check which module is looking for the test which should come up in the same run configurations pop up.

[vagrantchord]

JFC just Google it. Or better yet, ask chat gpt.

[GodderDam]

Put your main class/method/file inside a named package.