ts=2019-09-06T08:45:00.216+02:00 lvl=error msg="error evaluating expression" service=kapacitor task_master=main task=wincalculator node=influxdb_out16 err="invalid math operator * for type missing"

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Hi Team,
Error: ts=2019-09-06T08:45:00.215+02:00 lvl=error msg=“error evaluating expression” service=kapacitor task_master=main task=wincalculator node=influxdb_out16 err=“invalid math operator + for type missing”
ts=2019-09-06T08:45:00.215+02:00 lvl=error msg=“error evaluating expression” service=kapacitor task_master=main task=wincalculator node=influxdb_out16 err=“invalid math operator * for type missing”

dbrp "telegraf"."200_days"

var cpu_user = batch
    |query('SELECT 100 - last(Percent_Idle_Time) FROM "telegraf"."200_days".win_cpu where bu=\'DGFF\' and  instance=\'_Total\'')
        .period(5m)
        .every(5m)
        .groupBy('solution','service','environment','host')
        .align()
        .fill(0.0)
        |log()
        |sideload()
                .source('file:/appl/grafana/influx/kapacitor/conf/load/tasks/sideload')
                .order('{{.host}}.yml')
                .field('cpuval', 10.0)


var memusage = batch
   |query(''' SELECT last(Committed_Bytes) as commitedbytes,last(Available_Bytes) as availablebytes  FROM "telegraf"."200_days".win_mem where bu='DGFF' ''')
        .period(5m)
        .every(5m)
        .groupBy('solution','service','environment','host')
        .align()
        .fill(0.0)
        |log()
        |sideload()
                .source('file:/appl/grafana/influx/kapacitor/conf/load/tasks/sideload')
                .order('{{.host}}.yml')
                .field('memval', 10.0)
				
var swapusage = batch
    |query('SELECT last(Percent_Usage) FROM "telegraf"."200_days".win_swap where bu=\'DGFF\'')
        .period(5m)
        .every(5m)
        .groupBy('solution','service','environment','host')
        .align()
        .fill(0.0)
        |log()
        |sideload()
                .source('file:/appl/grafana/influx/kapacitor/conf/load/tasks/sideload')
                .order('{{.host}}.yml')
                .field('swapval', 10.0)
var cpuUsage=cpu_user
var memUsage=memusage
var swapUsage=swapusage

var Health_Score  = cpuUsage
    |join(memUsage,swapUsage)
        .as('cpuUsage','memUsage','swapUsage')
        .fill(0.0)
        |eval(lambda: ("memUsage.commitedbytes" / ("memUsage.availablebytes" + "memUsage.commitedbytes")) * 100.0).as('memHealth')
        |eval(
               lambda: (100.0-("cpuUsage.last" * "cpuUsage.cpuval")/10.0),
               lambda: (100.0-("memHealth" * "memUsage.memval")/10.0),
               lambda: (100.0-("swapUsage.last" * "swapUsage.swapval")/10.0)
               ).as('cpuHealth','memhealth','swaphealth')
    |influxDBOut()
        .cluster('name')
        .create()
        .database('testdb')
        .retentionPolicy('myrp')
        .measurement('measurement')

Need your assistance on this issue.