Executing an exe file on Plesk - asp.net

Question

I have created a web app using Asp.net and I have published my website on my domain(I'm using Plesk) and the website is functioning correctly. In one of my pages I execute an exe file in code behind which returns an output, which then will be printed in the page. It works correctly on local host, but on Plesk I get the error "This program is blocked by group policy". This is while I have set the CAS trust level to Full, I've enabled the "precompilie during publishing" option when I published the web app. I've erased the <system.codedom> tag in web.config, but the issue is still not fixed.
Here is the stack trace:
[Win32Exception (0x80004005): This program is blocked by group policy. For more information, contact your system administrator]
System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo) +1889
System.Diagnostics.Process.Start() +119
Project.StyleSheets.Result.Page_Load(Object sender, EventArgs e) in E:\Soroush\Programming\Spark\Project\Project\Result.aspx.cs:24
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
System.Web.UI.Control.OnLoad(EventArgs e) +95
System.Web.UI.Control.LoadRecursive() +59
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678
Line 24 is the line at which I start the exe file, namely I execute the following code:
Process compiler = new Process();
compiler.StartInfo.FileName = Server.MapPath("~/Program/dist/News-Fetcher/News-Fetcher.exe");
compiler.StartInfo.Arguments = string.Format("{0}", Request.QueryString["search"]);
compiler.StartInfo.UseShellExecute = false;
compiler.StartInfo.RedirectStandardOutput = true;
Line24: compiler.Start();
How can I solve his problem? Thanks!