Dapper.Contrib when insert occurred "ORA-00928" for oracle

I have some problem for insert use Dapper.Contrib.I have class like below

public class Company
{
    public int Id { get; set; } = 1;
    public string CompanyName { get; set; }
}

My table like below picture

If i am using sql to insert that is ok.If i use insert to mssql also success but if i use oracle that is wrong.I want show code to below.If You need deep details that must tell me.

public class Company
{
    public int Id { get; set; } = 1;
    public string CompanyName { get; set; }
}

public IDbConnection GetConnection 
{
    get
    {
        string connString = "Data source=localhost/book;User id=C##ANSON;Password=1234;";
        var conn = new OracleConnection(connString);
        return conn;
    }
}

public async Task<IHttpActionResult> Post() 
{
    var companys = new List<Company>();
    for (int i = 0; i < 5; i++)
    {
        companys.Add(new Company
        {
            CompanyName = $"company{i}"
        });
    }
    using (TransactionScope scope = new TransactionScope()) 
    {
        using (var con = GetConnection) 
        {

            //con.Execute("insert into company (companyname) values (:companyname)", companys.Select(x => new CompanyDto { CompanyName = x.CompanyName }));
            //if use above that is success.but if use below that will occurred ORA-00928
            con.Insert(companys);
            scope.Complete();
            return Ok();
        }
    }
} 

Start by reproducing con.Insert(companys) with the shown OracleConnection and compare its generated operation with the direct SQL insert that succeeds. The issue is resolved when inserting the Company list works with Oracle without ORA-00928 while preserving the existing SQL Server behavior.