СТЕПАН ПРИКОЛ 6

The given code snippet is attempting to deserialize an XML string into a `ServerMessage` object. The XML structure is expected to have a root element with either the tag `<success>` or `<error>`, and based on the root tag, different deserialization methods are called.

In this case, the error occurred at line 236 in the `ServerMessage` class, in the `deserializeSuccess` method. The exception message indicates that the XML structure is invalid. Specifically, it suggests that the child element of the root element does not have the expected structure.

To resolve this issue, you need to ensure that the XML structure matches the expected format. Here's an example of how the XML structure should look like for a `<success>` element:

```xml
<success>
    <!-- Content specific to success -->
</success>
```

Make sure that the XML string being deserialized has the correct structure.

If the XML structure is correct and you're still encountering this error, there might be an issue with the logic of the `deserializeSuccess` method or the tags being used. Double-check the implementation of `deserializeSuccess` and ensure that it correctly handles the expected child elements based on the XML structure.

Additionally, it's important to verify that the constants `TAG_ERROR`, `TAG_SUCCESS`, `TAG_LIST_USERS`, `TAG_EVENT`, `TAG_SESSION`, and `TAG_MESSAGE` have been defined correctly and match the corresponding XML tags.

Taking these steps should help you resolve the `IllegalArgumentException` related to the invalid XML structure.