Showing error while inserting data in table

System.Data.SqlClient.SqlException: Error converting data type varchar to numeric.

CREATE Proc [dbo].[Usp_EmployeeCheckLocation_Insert]            
@DeviceId nvarchar(50),            
@EmployeeCode nvarchar(50),            
@CallId nvarchar(50),            
@Latitude decimal(18,10),            
@Longitude decimal(18,10),            
@Status nvarchar(50),            
@Checkdate datetime,            
@Source nvarchar(25),    
@OtherVisitStatus nvarchar(50)          
AS            
IF @Status='CheckIn'            
BEGIN            
  INSERT INTO  EmployeeCheckLocation            
   (DeviceId,            
   EmployeeCode,            
   CallId,            
   Latitude,            
   Longitude,            
   Status,            
   CreatedOnUtc,            
   Source,    
     OtherVisitStatus)            
   values            
   (@DeviceId,            
   @EmployeeCode,            
   @CallId,            
   @Latitude,            
   @Longitude,            
   @Status,            
   @Checkdate,            
   @Source,    
   @OtherVisitStatus )            
END            

   [WebMethod]
        public string EmployeeAttendanceLocation(string lati, string longi, string status, string checkDate, string deviceId, string callId, string empCode, string Source, string ProjectName, string OtherVisitStatus)
        {
            SqlConnection myConnection = new SqlConnection();
            var conString = System.Configuration.
                 ConfigurationManager.ConnectionStrings["Server"];
            string strConnString = conString.ConnectionString;
            myConnection.ConnectionString = strConnString;
            myConnection.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = myConnection;
            cmd.CommandType = CommandType.StoredProcedure;
            string msg = null;
            //  DateTime date = DateTime.UtcNow;
            //  date = DateTime.Parse(checkDate);
            cmd.CommandText = "Usp_EmployeeCheckLocation_Insert";
         
           

                cmd.Parameters.AddWithValue("@DeviceId", deviceId.ToString());
                cmd.Parameters.AddWithValue("@EmployeeCode", empCode.ToString());
                cmd.Parameters.AddWithValue("@CallId",callId.ToString());
                cmd.Parameters.AddWithValue("@Latitude", lati.ToString());
                cmd.Parameters.AddWithValue("@Longitude", longi.ToString());
                cmd.Parameters.AddWithValue("@Status", status.ToString());
                cmd.Parameters.AddWithValue("@Checkdate", checkDate.ToString());
                cmd.Parameters.AddWithValue("@Source", Source.ToString());
                cmd.Parameters.AddWithValue("@OtherVisitStatus",SqlDbType.NVarChar).Value=DBNull.Value;
              

          
            int j = cmd.ExecuteNonQuery();
      
            if (j > 0)
            {

                msg = "success";
            }
            else
            {
                msg = "fail";
            }
            cmd.Connection.Close();
return msg;

}