丢失use App\Model\District;

app/JsonRpc/PublicRpcService.php

@@ -3,6 +3,7 @@ namespace App\JsonRpc;
 
 use App\Model\Department;
 use App\Model\LetterOfComplaint;
+use App\Model\District;
 use App\Model\LetterType;
 use App\Model\LevelUser;
 use App\Model\UserLevel;