> For the complete documentation index, see [llms.txt](https://buycoins.youngest.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://buycoins.youngest.dev/exceptions.md).

# Exceptions

On the request level, the `HTTPError` exception when caught in the `except` block is raised by one of the built-in custom exception classes.

These built-in custom classes help the developer to understand the source of the error. The built-in custom classes are:

* ServerError
* AccountError
* ClientError
* WalletError
* QueryError
* P2PError

The custom classes are built with this template:

```python
class ClassError(Exception):
    def __init__(self, *args):
        if args:
            self.message = args[0]
            self.status_code = args[1]
        else:
            self.message = None
            self.status_code = 404

    @property
    def response(self):
        return {
            "status": "error",
            "name": "ClassError",
            "code": self.status_code,
            "message": self.message
        }
```

where `ClassError` is one of the available exception classes in the library.

### Example

To return the appropriate error response for an invalid query, the library executes this block of code:

```python
if not query or query == "":
    raise QueryError("Invalid query passed!", 400)

try:
    # some block of code
except QueryError as e: # Catch the earlier raised exception.
    return e.response # { status: "error", "name": "QueryError", "code": 400, message: "Invalid query passed" }
```


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