Why am I getting a NotSupportedException when running MSpec in TeamCity?

Question

When I complete the MSpec build step in TeamCity, I get the following error in the team city logs:

[Step 7/7] Starting: C:\TeamCity\buildAgent\plugins\dotnetPlugin\bin\JetBrains.BuildServer.NUnitLauncher.exe #TeamCityImplicit [17:07:13][Step 7/7] in directory: C:\TeamCity\buildAgent\work\726e90173bc65483 [17:07:14][Step 7/7] 2012-10-02 17:07:14,471 [4332] ERROR JetBrains.TeamCity.Utils.Runtime.ParseUtil - Failed to load assembly from file c:\mspec\mspec.exe: An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework. This release of the .NET Framework does not enable CAS policy by default, so this load may be dangerous. If this load is not intended to sandbox the assembly, please enable the loadFromRemoteSources switch. See http://go.microsoft.com/fwlink/?LinkId=155569 for more information. [17:07:14][Step 7/7] System.NotSupportedException: An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework. This release of the .NET Framework does not enable CAS policy by default, so this load may be dangerous. If this load is not intended to sandbox the assembly, please enable the loadFromRemoteSources switch. See http://go.microsoft.com/fwlink/?LinkId=155569 for more information. [17:07:14][Step 7/7] at System.Reflection.RuntimeAssembly.nLoadFile(String path, Evidence evidence) [17:07:14][Step 7/7] at System.Reflection.Assembly.LoadFile(String path) [17:07:14][Step 7/7] at JetBrains.TeamCity.Utils.Runtime.ParseUtil.LoadAssembly(String value) in c:\BuildAgent\work\e6509710c0972c73\src\Utils\src\Runtime\ParseUtil.cs:line 110 

I made the proposed modification in the machine.config and MSpec config file, but it doesn't seem to help.

 <runtime> <loadFromRemoteSources enabled="true"/> </runtime> 

The MSpec runner refers to the compiled DLL locally in the build agent, which runs correctly locally in Visual Studio. Can someone explain what this error means and how can I solve it?

Answer 1

You can check the properties of mspec.exe or the "compiled dll" to see if there is a Security Unlock button . I had the same error and Unblock fixed it. Enabling loadFromRemoteSources did not help.