The remote server returned an error: (403) Forbidden

[JiksSummit]

Hi there,
I am getting following error when trying to access Jot form API through its C# library.

System.Net.WebException was unhandled
Message=The remote server returned an error: (403) Forbidden.
Source=System
StackTrace:
at System.Net.HttpWebRequest.GetResponse()
at JotForm.APIClient.executeHttpRequest(String path, NameValueCollection parameters, String method) in C:\Users\User\Documents\Visual Studio 2008\Projects\JotForm\jotform-api-csharp-master\jotform-api-csharp-master\JotForm\APIClient.cs:line 87
at JotForm.APIClient.executeGetRequest(String path, NameValueCollection parameters) in C:\Users\User\Documents\Visual Studio 2008\Projects\JotForm\jotform-api-csharp-master\jotform-api-csharp-master\JotForm\APIClient.cs:line 142
at JotForm.APIClient.getForms(Int32 offset, Int32 limit, Dictionary`2 filter, String orderBy) in C:\Users\User\Documents\Visual Studio 2008\Projects\JotForm\jotform-api-csharp-master\jotform-api-csharp-master\JotForm\APIClient.cs:line 255
at JotFormTest.Program.Main(String[] args) in C:\Users\User\Documents\Visual Studio 2008\Projects\JotForm\jotform-api-csharp-master\jotform-api-csharp-master\JotFormTest\Program.cs:line 27
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:

your help will be much appreciated.
Thanks,