E! missing value error

I have a measurement SchedulerCpuTable. I have following tick script to collect values from that measurement

var sched_cpu_stream = stream
|from()
.database(‘iAgent’)
.retentionPolicy(‘autogen’)
.measurement(‘SchedulerCpuTable’)
|eval(lambda: “10_seconds”,lambda: “1_minute”)
.as(‘10_sec’,‘1_min’)

sched_cpu_stream
|eval(lambda: bool((“10_sec” < 80) AND (“1_min” < 80)))
.as(‘a’)
|influxDBOut()
.database(‘iAgent’)
.measurement(‘ospf_final_rev7’)

However i keep getting following error in Kapacitor logs
tp3:eval2] 2017/12/12 12:49:23 E! missing value: “10_seconds”
[tp3:eval2] 2017/12/12 12:49:23 E! missing value: “10_seconds”
[tp3:eval2] 2017/12/12 12:49:23 E! missing value: “1_minute”

I do have those fields in table as shown below

show field keys from SchedulerCpuTable
name: SchedulerCpuTable
fieldKey fieldType


10_seconds integer
1_minute integer
1_second integer
5_seconds integer