Error when trying to load and run a page report from a share.

I am getting the below error when trying to run a report in my app.

This method implicitly uses CAS policy, which has been obsoleted by the .NET Framework. In order to enable CAS policy for compatibility reasons, please use the NetFx40_LegacySecurityPolicy configuration switch

I have tried to apply this fix and the application won’t even start. After searching the web it says I also need to run the caspol.exe tool on my network share folder to give it full trust. This does not work either. What do I need to do to get this page report to run?