System.BadImageFormatException

[bmccabe]

Since the last update I'm getting this when I do a build. If I try to generate step definitions I get told that all steps are bound. If I switch back to SpecFlow I don't get the error.

Info: OnActivityStarted: Starting Deveroom...
Info: CreateProjectScope: Initializing project: Featuretests2
Info: OnSettingsInitialized: Project settings initialized: .NETFramework,Version=v4.7.1,SpecFlow:3.0.225
Warning: InvokeDiscovery: Error during binding discovery. 
Command executed:
  C:\Users\robertm\source\repos\WindowsFormsApp4\UnitTestProject2\bin\Debug> c:\users\robertm\appdata\local\microsoft\visualstudio\15.0_8984b99c\extensions\4v220uaj.2mr\Connectors\V1\deveroom-specflow-v1.exe discovery C:\Users\robertm\source\repos\WindowsFormsApp4\UnitTestProject2\bin\Debug\FeatureTests2.dll C:\Users\robertm\source\repos\WindowsFormsApp4\UnitTestProject2\App.config
Exit code: 4
Message: 
Error: Could not load file or assembly 'file:///C:\Users\robertm\source\repos\WindowsFormsApp4\UnitTestProject2\bin\Debug\FeatureTests2.dll' or one of its dependencies. An attempt was made to load a program with an incorrect format.
Exception: System.BadImageFormatException
StackTrace:

Server stack trace: 
   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm, Boolean forIntrospection, Boolean suppressSecurityChecks, StackCrawlMark& stackMark)
   at System.Reflection.Assembly.LoadFrom(String assemblyFile)
   at Deveroom.VisualStudio.SpecFlowConnector.Discovery.RemotingBaseDiscoverer.Discover(String testAssemblyPath, String configFilePath)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at Deveroom.VisualStudio.SpecFlowConnector.Discovery.IRemotingSpecFlowDiscoverer.Discover(String testAssembly, String configFilePath)
   at Deveroom.VisualStudio.SpecFlowConnector.Discovery.DiscoveryProcessor.Process()
   at Deveroom.VisualStudio.SpecFlowConnector.ConsoleRunner.EntryPoint(String[] args)

Warning: InvokeDiscovery: The project bindings (e.g. step definitions) could not be discovered. Navigation, step completion and other features are disabled. 
  Please check the error message above and report to https://github.com/specsolutions/deveroom-visualstudio/issues if you cannot fix.
Warning: ShowProblem: User Notification: All steps have been defined in this file already.