Database Connector error on wep portal


I use database connector in Knime Analytics Platform and it goes well. But when i try to run the same workflow on web appear error:

Database Connector 4:260
Execute failed: Could not create connection to database: Could not find driver class:

It looks like i missed to set jdbc driver for knime server but i don't know where.

Help, please, who know


I used native SQL Server connector and this solve problem