Solved: “Cannot execute a program. The command being executed was \roslyn\csc.exe”

When you publish your ASP.NET project to a hosting account such as GoDaddy, you may run into the issue below. This issue may occur even though your code works fine in localhost.

Server Error in ‘/’ Application.
.
Parser Error 
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
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Parser Error Message: Cannot execute a program. The command being executed was “G:\PleskVhosts\website.com\httpdocs\bin\roslyn\csc.exe” /shared /keepalive:”10″ /noconfig  /fullpaths @”C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\4a4c810d\6d29243e\slpxwrhm.cmdline”.

Resolution

A simple solution for this issue is that removing Roslyn compiler plugin from your project and using old compiler. In order to remove Roslyn:
  1. Ffollow “Tools > NuGet Package Manager > Manage NuGet Packages for Solution” in Visual Studio
  2. Find “DotNetCompilerPlatform” and uninstall it

Source: https://social.msdn.microsoft.com/Forums/vstudio/en-US/442b100a-2b88-4ac4-b655-0c1345791f15/roslyn-cscexe-web-api-2-on-hosting-server?forum=msbuild

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