> For the complete documentation index, see [llms.txt](https://move-developers-dao.gitbook.io/aptos-move-by-example/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://move-developers-dao.gitbook.io/aptos-move-by-example/basic-concepts/error.md).

# Error

You can throw an error by calling  `assert` and `abort`.

**Abort:**

`abort error_code //error code is of type u64`

```rust
module my_addrx::Errors
{
    use std::debug::print;
    use std::string::utf8;

    fun isEven(num:u64)
    {
        if(num%2==0)
        {    
            print(&utf8(b"No Error as the Number is Even"));
        }
        else    
        {    
            abort 11 //throwing error as the given number is not even
        }
    }

    #[test]
    fun testing()
    {
        isEven(3);
    }
}
```

**Assert:**

`assert!(expression: bool, error_code: u64)`

```rust
module my_addrx::Errors
{

    fun isEven(num:u64)
    {
        assert!(num%2==0,11);
    }

    #[test]
    fun testing()
    {
        isEven(3);
    }
}
```


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