# AssertionError: A blueprint cannot be registered more than once

- **ID:** `python/flask-blueprint-registration`
- **Domain:** python
- **Category:** config_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

在Flask应用中重复注册同一个蓝图实例。

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **** (95% success)
   ```
   只注册一次：
from blueprints import auth_bp
app.register_blueprint(auth_bp)
# 不要再次注册
   ```
2. **** (90% success)
   ```
   每次创建新实例：
auth_bp = Blueprint('auth', __name__)
app.register_blueprint(auth_bp)
   ```

## Dead Ends

- **** — 尝试创建新蓝图但使用了相同名称。 (60% fail)
- **** — 在多个文件中导入并注册同一蓝图。 (80% fail)