Facing error when trying to mock a Method in Concrete Class

Below is my code and the test I am trying to write for CoreException class

Inside CoreException I am calling LogMgr which is a concrete class

    public class CoreException
    {

        public CoreException()
        {

        }

        public void HandleException(string inErr)
        {
            LogMgr.Instance.Trace("", "");
        }
    }

public class LogMgr
{
    private static LogMgr mInstance = null;

    public static LogMgr Instance
    {
        get
        {
            if ((null == mInstance) )
            {
                mInstance = new LogMgr();
            }
            return mInstance;
        }
    }

    public void Trace(string logFormat, string logParams)
    {
        Console.WriteLine("Log Saved");
    }
}

Below are my Unit Tests…..

namespace TestProject1
{

    public static class LogMgrMock
    {
        public static Mock<LogMgr> GetMock()
        {
            var mock = new Mock<LogMgr>();
            mock.Setup(m => m.Trace(It.IsAny<string>(), It.IsAny<string>())).Verifiable();
            return mock;
        }
    }
    public class CoreExceptionTests
    {
        [Fact]
        public void TestException()
        {
            var coreExec = new CoreException();
            var mockLogMgr = LogMgrMock.GetMock();
            baservException.HandleException("Test");

            mockLogMgr.Verify(m => m.Trace(It.IsAny<string>(), It.IsAny<string>()), Times.Once);
        }
    }
}

Below is the exception Iam facing

System.NotSupportedException : Unsupported expression: m => m.Trace(It.IsAny<string>(), It.IsAny<string>().....  Non-overridable members (here: LogMgr.Trace) may not be used in setup / verification expressions