Gatling during configuration in scenario and 502 Http error

When I set the scenario in gatling to run during 1 hour the execution result throw me the next error:

i.g.h.a.AsyncHandlerActor - Request 'List' failed: status.find.in(200,304,201,202,203,204,205,206,207,208,209), but actually found 502

I tried to add .disableCaching and .shareConnections in httpConf configuration but I'm in the same situation.

Scenario configuration:

val filter = scenario("FilterSearch").during(1 hours){exec(Login.login, FilterSearchPurchase.search)}

User injection:

setUp( filter.inject(splitUsers(50) into(atOnceUsers(10)) separatedBy(5 minutes)).protocols(httpConf) )

When I try to execute without .during() everything goes correctly.

Thanks.