error while executing BPNN PAL

Hi all. I am testing creating a simple BPNN train from a table which contains sampleNum and heartRate using flowgraph. I can activate the flowgraph but when I try to execute SQL query it gives me following error.

Could not execute 'CALL "AFMUSER"."healthCharts.PALflowgraphs::bpnnTest"()' in 1.043 seconds .

SAP DBTech JDBC: [423]: AFL error:  [423] "AFMUSER"."healthCharts.PALflowgraphs::bpnnTest": line 5 col 1 (at pos 118): [423] (range 3) AFL error exception: _SYS_AFL.AFLPAL:CREATEBPNN: [423] (range 3) AFL error exception: exception 73001030: PAL error[73001030]:Data type of column $COL$ is not supported

Can anybody guide me what am I doing wrong. The data type of sampleNum is Integer and of heartRate is double.