1. Error: unserialize(): Unexpected end of serialized data, as shown in Figure 1
2. Edit \framework\caching\CCache.php and print out $value, as shown in Figure 2
3. The printed result has the value: }, as shown in Figure 3
4. Edit \framework\web\CUrlManager.php and print out self::CACHE_KEY, as shown in Figure 4
5. The printed result has the value: Yii.CUrlManager.rules, as shown in Figure 5
6. Open the URL: https://github.com/yiisoft/yii/issues/4137, and you will find the same issue, as shown in Figure 6
7. Following the issue resolution instructions, upgrade Yii Framework to 1.1.19, as shown in Figure 7
8. Delete the framework directory in the program, and copy the downloaded framework directory into the program, as shown in Figure 8
9. After the upgrade, the issue is resolved.