An error has occurred when running my project

I am having trouble running my project. When I try to run it, I get the following error message:

```
Error: Could not find or load main class [Main class name]
```

I have tried searching for this error message online, but I have not been able to find any solutions that work for me. I am using [IDE name] version [IDE version] on [Operating system] version [OS version]. Here is the code that I am trying to run:

```java
[Code]
```

Any help would be greatly appreciated.V