Error : Distribution database exists , but there is no such database in system database

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SQL

server

snapshot

replication

I am getting this error while creating distribution database. I am trying to setup snapshot replication on sql server 2008

TITLE: Distributor Properties
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Could not add distribution database 'distribution'.

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.50.1600.1&EvtSrc=Microsoft.SqlServer.Management.UI.DistributorPropertiesErrorSR&EvtID=CantAddDistributionDB&LinkId=20476

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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Could not add the distribution database 'distribution'. This distribution database already exists.
Changed database context to 'master'. (Microsoft SQL Server, Error: 14119)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.50.1600&EvtSrc=MSSQLServer&EvtID=14119&LinkId=20476

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BUTTONS:

OK
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