machine.config

good morning

when I configure the gateway with an Oracle source, I get the following error:
The registered .NET Framework data provider cannot be found or loaded. This is a configuration problem with the file
'C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config'.

In the machine.config file I have this entry

<DbProviderFactories>
<add name="ODP.NET, Unmanaged Driver" invariant="Oracle.DataAccess.Client" description="Oracle Data Provider for .NET, Unmanaged Driver" type="Oracle.DataAccess.Client.OracleClientFactory, Oracle.DataAccess, Version=4.112.3.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</DbProviderFactories>

can someone help me?

Thank´s a lot