Why the "Active Users along the Simulation" in report is 0?

You can see the All users is 0 to the end.

Here is my setUp code:

`

val steps = feed(randomGeoFeeder)
.exec(
Login.login,
Brownse.brownse
)

val scn = scenario(“大量用户浏览商品”)
.feed(randomOffsetFeeder)
.feed(randomCodeFeeder)
.doIfOrElse(DURATION > 0) {
forever(
exec(steps)
)
} {
exec(steps)
}

val injectStrategy =
if (USERS_COUNT > 10) {
splitUsers(USERS_COUNT) into(rampUsers(10) over(5 seconds)) separatedBy(10 seconds)
} else {
atOnceUsers(USERS_COUNT)
}

val setup = setUp(
scn.inject(
injectStrategy
).protocols(httpProtocol)
)

if (DURATION > 0) {
setup.maxDuration(DURATION minutes)
}

`