Task Report Tasks for Loggedinuser()

Hi Everyone,

i have built a task report when i try to filter based on user by using the query filter ,there is no data appeared in my grid. there are groups and users in my column c4.

a!queryFilter(
field: "c4",
operator: "=",
value:loggedInUser()
),

. i also tried using contextUsers: loggedInUser(), it throws an error (APNX-1-4156-000)]