Sections must only appear once per config file.

hi,

my web config is:

<membership><providers><clear/><add name="AspNetSqlMembershipProvider"
         type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
         connectionStringName="ApplicationServices"
         enablePasswordRetrieval="false"
         enablePasswordReset="true"
         requiresQuestionAndAnswer="false"
         requiresUniqueEmail="false"
         passwordFormat="Hashed"
         maxInvalidPasswordAttempts="5"
         minRequiredPasswordLength="6"
         minRequiredNonalphanumericCharacters="0"
         passwordAttemptWindow="10"
         passwordStrengthRegularExpression=""
         applicationName="/"
            /></providers></membership><profile><providers><clear/><add name="AspNetSqlProfileProvider"
         type="System.Web.Profile.SqlProfileProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
         connectionStringName="ApplicationServices"
         applicationName="/"
            /></providers></profile><roleManager enabled="false"><providers><clear /><add connectionStringName="ApplicationServices" applicationName="/" name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /><add applicationName="/" name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /></providers></roleManager>

but i get error:

Sections must only appear once per config file. 

how i do? please help me