Your project is referencing something that references v1.0.5000.0 of System.Windows.Forms, but you do not have that version. The warning is suggesting that you add a remapping to v3.5.0.0 of that assembly so that it will work properly. You do this in the app.config
file. It is suggesting that you add this file to your project and add the mapping to it.
Something like this should work:
<?xml version="1.0"?>
<configuration>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Windows.Forms" publicKeyToken="969db8053d3322ac" culture="neutral" />
<bindingRedirect oldVersion="1.0.5000.0" newVersion="3.5.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>