Error in SharePoint 2013 Provider Hosted App while testing it using visual studio

Dear Experts,

I am facing problem with SharePoint 2013 Provider Hosted App as per below image and description:

• When I run it through Visual Studio it gives me the option to trust it. 
• When I click on Trust it button it gives me error



For Your reference:

• I have followed the following blog's to create my app:

http://www.malneedinani.com/2014/01/step-by-step-process-to-create-provider.html

http://msdn.microsoft.com/en-us/library/office/fp179901(v=office.15).aspx

http://ranvijaysingh.blogspot.com/2013/04/develop-provider-hosted-app-on-single.html

http://msdn.microsoft.com/en-us/library/office/fp179923(v=office.15).aspx

• I have also, signed my assembly with strong name. and have already put security levelf ull in web.config as follows:

Can any one help me in this. 

Regards

HBkhan