Entity Framework 6 an Oracle

Question

I am trying to use Oracle Database with Entity Framework 6 (.net 4.8 and MVC5).

All the queries I try to perform make this exception:

The store type 'text' could not be found in the OracleEFProvider provider manifest

An example:

try 
{
   using (SXEntities db = new SXEntities()) 
   {
      db.MyModel.ToList();
   }
} 
catch (Exception e) 
{
   Log.Error(e.Message);
}