thanks for the hint!

I've installed version 3.0 and now I'm getting:

unsupported on-disk structure for file C:\DATA\DATABASE.FDB; found 10.0, support 12.2
IProvider::attachDatabase failed when loading mapping cache
No message for error code 336330835 found

from  FirebirdSql.Data.FirebirdClient.

nice improvement… :)

what's this error now?

HELP!