---
title: "LOCALDB_ERROR_UNKNOWN_INSTANCE | Microsoft Docs"
ms.custom: ""
ms.date: "03/03/2017"
ms.prod: sql
ms.reviewer: ""
ms.technology: performance
ms.topic: "reference"
ms.assetid: 67bca4f1-915d-46d4-9293-3742c16930a1
author: stevestein
ms.author: sstein
---
# LOCALDB_ERROR_UNKNOWN_INSTANCE
[!INCLUDE[appliesto-ss-xxxx-xxxx-xxx-md](../../includes/appliesto-ss-xxxx-xxxx-xxx-md.md)]
    
## Details  
  
|||  
|-|-|  
|Product Name|SQL Server|  
|Event ID|263|  
|Event Source|SQL Server Local Database Runtime 12.0|  
|Component|Local Database Runtime API|  
|Message Text|The specified Local Database instance does not exist.|  
  
## Explanation  
 The specified instance does not exist.  
  
## User Action  
 Check if the specified instance name is correct.