How to resolve the Data type error when using templated date filter?

[mv932t]

Kindly help me to resolve the datatype error in templated filter.
Attached error screenshot for reference.

logic used:

filter: timeframe_a {
type: date_time
}

## flag for "A" measures to only include appropriate time range
dimension: group_a_yesno {
hidden: yes
type: yesno
sql: {% condition timeframe_a %} ${event_timestamp_raw} {% endcondition %} ;;
}

measure: count_b {
type: count
filters: [group_a_yesno: "yes"]