Help with Exit code 134 on macos Catalina

I started getting the error below when running unit tests in Rider. I've restarted Rider, performed clean, rebuild & build solution multiple times, have done a full system restart but continue to get this error. Can anyone offer suggestions on how to correct this? 

NoteAffect.WebServer.Tests.Queries.SeriesQueryTests.Execute_Return

Run was aborted

Last runner error: Process /usr/local/share/dotnet/dotnet:2388 exited with code '134': Unhandled Exception: System.BadImageFormatException: Could not load file or assembly '/Applications/Rider.app/Contents/lib/ReSharperHost/TestRunner/netcoreapp2.0/ReSharperTestRunner32.dll'. An attempt was made to load a program with an incorrect format.

--- EXCEPTION #1/1 [LoggerException]
Message = “
Process /usr/local/share/dotnet/dotnet:2388 exited with code '134':


Unhandled Exception: System.BadImageFormatException: Could not load file or assembly '/Applications/Rider.app/Contents/lib/ReSharperHost/TestRunner/netcoreapp2.0/ReSharperTestRunner32.dll'. An attempt was made to load a program with an incorrect format.
”
ExceptionPath = Root
ClassName = JetBrains.Util.LoggerException
HResult = COR_E_APPLICATION=80131600
StackTraceString = “
at JetBrains.ReSharper.UnitTestFramework.TestRunner.TestRunnerRunStrategy.OnExit(IPreparedProcess runner, Int32 exitCode, IUnitTestRun run)
at JetBrains.ReSharper.UnitTestFramework.TestRunner.TestRunnerRunStrategy.Run(IUnitTestRun run)
at JetBrains.ReSharper.UnitTestFramework.Launch.UnitTestRun.StartCore(CancellationToken onCancel, CancellationToken onAbort)
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine)
at JetBrains.ReSharper.UnitTestFramework.Launch.UnitTestRun.StartCore(CancellationToken onCancel, CancellationToken onAbort)
at JetBrains.ReSharper.UnitTestFramework.Launch.UnitTestRun.Start(CancellationToken onCancel, CancellationToken onAbort)
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine)
at JetBrains.ReSharper.UnitTestFramework.Launch.UnitTestRun.Start(CancellationToken onCancel, CancellationToken onAbort)
at JetBrains.ReSharper.UnitTestFramework.Launch.Stages.RunTestsStage.<>c__DisplayClass5_0.<StartRunChained>b__0()
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
at System.Threading.ThreadPoolWorkQueue.Dispatch()
”

Last launch log file: /Users/chris/Library/Logs/JetBrains/Rider2020.2/UnitTestLogs/Sessions/2020-08-27-10-28-38-658___1d7b417b-2220-4d2c-9a16-62d91441e654.log