Error when adding a configuration to App.config file

Question

Related question: Running my application on another machine gives me an error

This is how my App.config file looks like:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <connectionStrings>
    <add name="DocumentsDBEntities" connectionString="metadata=res://*/Documents.csdl|res://*/Documents.ssdl|res://*/Documents.msl;provider=System.Data.SQLite;provider connection string=&quot;data source=C:\Users\Sergio.Tapia\Desktop\DocumentScannerDanyly\DocumentScannerDanyly\DocumentsDB.sqlite&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
  <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" />
  </startup>
  <appSettings>
    <add key="Username" value="administrador"/>
    <add key="Password" value="123456"/>
  </appSettings>
</configuration>

Running this on my dev machine works, but when deploying to another computer, I get an Data Provider error. (see related question above).

The suggested solution was to add this to the App.config file:

<system.data>
        <DbProviderFactories>
                <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite"/>
        </DbProviderFactories>
</system.data>

When I add that to the App.config file, I get this error when launching the application in Visual Studio 2010:

An error occurred creating the configuration section handler for system.data: Column 'InvariantName' is constrained to be unique. Value 'System.Data.SQLite' is already present. (C:\Users\Sergio.Tapia\Desktop\DocumentScannerDanyly\DocumentScannerDanyly\bin\Debug\DocumentScannerDanyly.vshost.exe.Config line 13)

Any suggestion on what this error is? Also, since the location of the .sqlite file is relative to where it is installed, do I have to change the connectionString in the AppConfig file to something more dynamic?

Thanks for the help.

EDIT:

When I add this to the config as suggested by someone here, I get an error:

<system.data>
        <DbProviderFactories>
                <clear />
                <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite"/>
        </DbProviderFactories>
</system.data>

Failed to find or load the registered .Net Framework Data Provider.

Answer 1

The problem is most likely that you hard code a path to your desktop in your connection string:

C:\Users\Sergio.Tapia\Desktop\DocumentScannerDanyly\DocumentScannerDanyly\DocumentsDB.sql

Unless this file is present with the exact same location on the other machine, chances iare it won't work