Association rules: FPGrowth

KNIME Analytics Platform
1

I would like to create workflow in KNIME with fpgrowth algorithm, but I get the following error :

ERROR     7)                                 Execute failed: Weka associator can not work with given data. Reason: weka.associations.FPGrowth: Cannot handle multi-valued nominal attributes!

I have previously discretized data.

Thanks in advance.

2

try using the domain calculator node before the weka node?