I am getting the following error trying to declare a variable in my pinescript.

Cannot call 'input' with 'defval'=series[integer]

Script code:

// Function to determine the input value based on the timeframe
f_get_period_input() =>
    var int period = na
    if (timeframe.isintraday and timeframe.multiplier == 60) // Hourly timeframe
        period := 24
    else if (timeframe.isdaily) // Daily timeframe
        period := 30
    else
        period := na

// Get the appropriate period value
period_input = f_get_period_input()

// Use the period_input in your script
periods = input(period_input != na ? period_input : 3, minval=1, title="Moving Average Period")