The entry 'admin' has already been added.

[micky]

Error message and webconfig file are like this..
it says "The entry 'admin' has already been added." but i didn't add admin
user .
what's problem??
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Configuration Error
Description: An error occurred during the processing of a configuration file
required to service this request. Please review the specific error details
below and modify your configuration file appropriately.

Parser Error Message: The entry 'admin' has already been added.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

<authentication mode="Forms">
<forms name=".AUTHADMIN" loginUrl="Default.aspx" protection="All"
timeout="20">
<credentials passwordFormat="SHA1">
<user name="admin"
password="356A192B7913B04C54574D18C28D46E6395428AB" />
</credentials>
</forms>
</authentication>