I have a .NET Core 3.1 app. Using the latest release of VistaDB. I'm getting an error and can't figure out what I'm doing wrong. I'm inserting a string into the database via a stored procedure.

CREATE PROCEDURE [INSERT_Interval]
@name VarChar,
    @id BigInt OUT
AS
BEGIN
INSERT INTO Intervals ([Name]) VALUES (@name);

SET @id = SCOPE_IDENTITY();

RETURN @id;
END

 The table structure is ID bigint and Name Varchar(100). 

        public Interval Create(Interval input)
        {
            using var conn = new VistaDBConnection { ConnectionString = ConnectionString };
            using var comm = conn.CreateCommand();

            comm.CommandText = @"INSERT_Interval";
            comm.CommandType = CommandType.StoredProcedure;

            var nameParameter = comm.CreateParameter();
            var idParameter = comm.CreateParameter();

            idParameter.ParameterName = @"@id";
            idParameter.DbType = DbType.Int64;
            idParameter.Direction = ParameterDirection.Output;

            nameParameter.ParameterName = @"@name";
            nameParameter.DbType = DbType.String;
            nameParameter.Value = input.IntervalName;

            comm.Parameters.Add(idParameter);
            comm.Parameters.Add(nameParameter);

            if (conn.State != ConnectionState.Open)
            {
                conn.Open();
            }

            var output = comm.ExecuteNonQuery();

            var objId = comm.Parameters[@"@id"].Value;

            if (conn.State != ConnectionState.Closed)
            {
                conn.Close();
            }

            long.TryParse(objId?.ToString(), out var id);

            input.Id = id;

            return input;
        }

        [Test]
        public void InsertIntervalUnitTest()
        {
            var provider = new IntervalProvider(_connectionString);
            var interval = new Interval { IntervalName = @"Test" };

            interval = provider.Create(interval);

            Assert.IsInstanceOf(typeof(Interval), interval);
            Assert.IsTrue(interval.Id != 0L);

        }

System.OverflowException
  HResult=0x80131516
  Message=Value was either too large or too small for an Int32.
  Source=System.Private.CoreLib
  StackTrace:
   at System.Convert.ThrowInt32OverflowException()
   at System.Convert.ToInt32(Int64 value)
   at System.Int64.System.IConvertible.ToInt32(IFormatProvider provider)
   at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
   at System.Convert.ChangeType(Object value, Type conversionType)
   at VistaDB.Engine.Core.IntColumn.set_Value(Object value)
   at VistaDB.Engine.Core.Row.Column.VistaDB.Engine.Internal.IValue.set_Value(Object value)
   at VistaDB.Engine.SQL.Signatures.ScopeIdentityFunction.InternalExecute()
   at VistaDB.Engine.SQL.Signatures.Signature.Execute()
   at VistaDB.Engine.SQL.SetVariableStatement.OnExecuteQuery()
   at VistaDB.Engine.SQL.Statement.ExecuteQuery()
   at VistaDB.Engine.SQL.BatchStatement.NextResult(VistaDBPipe pipe)
   at VistaDB.Provider.VistaDBDataReader.GoNextResult()
   at VistaDB.Provider.VistaDBDataReader..ctor(IQueryStatement statement, VistaDBConnection connection, CommandBehavior commandBehavior)
   at VistaDB.Engine.SQL.BatchStatement.OnExecuteQuery()
   at VistaDB.Engine.SQL.Statement.ExecuteQuery()
   at VistaDB.Engine.SQL.Signatures.StoredProcedure.ExecuteSubProgram()
   at VistaDB.Engine.SQL.Signatures.ProgrammabilitySignature.PrepareExecute(Object& resValue)
   at VistaDB.Engine.SQL.Signatures.ProgrammabilitySignature.InternalExecute()
   at VistaDB.Engine.SQL.Signatures.Signature.Execute()
   at VistaDB.Engine.SQL.ExecStatement.OnExecuteQuery()
   at VistaDB.Engine.SQL.Statement.ExecuteQuery()
   at VistaDB.Engine.SQL.BatchStatement.NextResult(VistaDBPipe pipe)
   at VistaDB.Provider.VistaDBDataReader.ExecQuery(Int64& affectedRows)
   at VistaDB.Provider.VistaDBCommand.ExecQuery(Int64& affectedRows)
   at VistaDB.Provider.VistaDBCommand.ExecuteNonQuery()
   at Budget.Data.IntervalProvider.Create(Interval input) in C:\Users\Ben\source\repos\Budget\Data\IntervalProvider.cs:line 44
   at DataUnitTests.IntervalUnitTests.InsertIntervalUnitTest() in C:\Users\Ben\source\repos\Budget\DataUnitTests\IntervalUnitTests.cs:line 23

  This exception was originally thrown at this call stack:
    [External Code]
    Budget.Data.IntervalProvider.Create(Budget.Dto.Interval) in IntervalProvider.cs
    DataUnitTests.IntervalUnitTests.InsertIntervalUnitTest() in IntervalUnitTests.cs