# Java : could not find or load main class error in vs code while running a file inside package

### Making Packages in Java

The package in java is used to group related classes , In other IDE's like IntelliJ Idea and Eclipse , they have build in environment for java development not as the VS code.

### How to make package in VS Code ?

You just need to make a directory inside your source folder and move the related classes inside that directory. You will notice the vs code will automatically add a line of code `Package Packagename;` on the first line of the code that line declares that this class is inside a package called Packagename.

### What if you directly run the code now ?

If you run the code directly in VS Code , lets run it by doing `javac filename.java` then `java classname`

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1708150290886/523e0432-be0e-46fd-b042-aa4093f22351.png align="center")

just take a look at the above picture the java file is compiled successfully, Now lets try to run it with `java classname`

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1708150391952/788a9879-f9ae-4b4f-be52-0c040e201a81.png align="center")

As we can see running this file gives an error that is `Could not find or load main class classname` .

### How to resolve this error ?

This is a common error occurs when we try to directly execute the class , but execution of java class inside package is slightly different from executing a normal java class , **Java says that if the file is inside a package, so you first need to compile it being inside that package and then execute the file by jumping to the root folder of that package and then executive it as java** `packagename.classname`**.**

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1708150838727/1a381ca9-eda0-4475-8169-a0d9ae4b3fd1.png align="center")

You can see it is working and executing perfectly fine.