Exception: CS, Specified RDBMS is invalid

Hello,

when running a report in Desktop Intelligence based on a univere on the CMS-Server (e.g. eFashion,Activity ...) I get this error:

Connection or SQL sentence error (DA0005): Exception: CS, Specified RDBMS is invalid

or

Exception: DBD, [unixODBC][Driver Manager]Data source name not found, and no default driver specifiedState: IM002

My BOE XI 3.1runs with MySQL and Tomcat on a Linux server.

Any suggestions?

Thanks

Axel