LPAREN error for Flux query

import "math"

from(bucket: "Lybover")
 |> range(start: v.timeRangeStart, stop: v.timeRangeStop)
 |> filter(fn: (r) => r["topic"] == "RAGG_UF_Flow")
 |> filter(fn: (r) => r["_field"] == "metrics_0_value")
 |> filter(fn: (r) => r["_measurement"] == "mqtt_consumer")
 |> filter(fn: (r) => r["host"] == "machinedatalinux")
 |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
 |> map(fn: (r) => ( _time: r._time, _value: math.sqrt((2.0 * r._value) / 2232.93)))
 |> yield(name: "mean")

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