[Firebird-net-provider] dynamic SQL error

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Hi,
I can't make my .NET data provider for Firebird work.
I have Firebird 1.5 RC 8, the appropriate .Net driver and
i'm using Visual Studio (C#) .NET 2003. (on Windows XP)
I have no problems to establish a connection, start a transaction
but whenever I try to execute a command (anyhow) the driver throws
an exception. It says Dynamic SQL error - 901, feature is not supported.

I have tried several versions of Firebird and/or the driver but
everything keeps being the same.
I'm trying everything locally.

Can anybody help me please?

thanks a million