Builder fails to get the right database type when it tries to get the object categories.
Install the OVPI 5.31 patch on the client machines.
If only the client Builders have this problem then it is not necessary to upgrade the entire OVPI installation to OVPI 5.31. Only the OVPI clients machines need to be upgraded.
If any Builders installed on any OVPI servers exhibit this problem then the entire OVPI installation must be upgraded to OVPI 5.31.