Getting error running SP from c# application

I have the following method:

        public bool CheckEmail(string email)
        {
            bool success = false;
            string name;


                using (SqlConnection con = new SqlConnection(Internal_Audit_Capture.Properties.Settings.Default.Intenal_AuditDB))
                {
                    con.Open(); 
                    try
                    {
                        using (SqlCommand command = new SqlCommand("IntAudit.p_checkEmail", con))
                        {


                            command.CommandType = CommandType.StoredProcedure;
                            command.Parameters.Add(new SqlParameter("@email", maskedTextBox1.Text.Trim()));
                            command.Parameters.Add("@success", SqlDbType.Bit).Direction = ParameterDirection.Output;
                            command.Parameters.Add("@name", SqlDbType.VarChar).Direction = ParameterDirection.Output;
                            command.ExecuteNonQuery();
                            success = (bool)command.Parameters["@success"].Value;
                            name = (string)(command.Parameters["@name"].Value);
                        }

                        return success;
                    }
                    
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.ToString());
                        return success;
                    }
                }
        }

p_CheckEmail queries the table:

[IntAudit].[LOGINDETAILS](
	[ID] [int] IDENTITY(1,1) NOT NULL,
	[NAME] [varchar](30) NOT NULL,
	[PASSWORD] [nvarchar](30) NOT NULL,
	[ADMIN] [bit] NULL,
	[EMAIL] [varchar](50) NOT NULL,
PRIMARY KEY CLUSTERED 
(
	[ID] ASC
)

And the procedure is:

 create procedure IntAudit.p_checkEmail
 @email varchar(50),
 @success bit OUTPUT,
 @name varchar(30) OUTPUT
 as

 set nocount on;

 if(exists(select 1 from [IntAudit].[LOGINDETAILS] where [EMAIL] = @email))
  begin
   select @name = [NAME] from [IntAudit].[LOGINDETAILS] where [EMAIL] = @email
   set @success = 1
   return
  end
 else
  begin
   set @name = null
   set @success = 0
   return
  end

  go
 

Now it runs fine in SSMS but I get the following error in debug from the application:

Any advice or clue will be highly appreciated.