Randomising eventId of Post body with random ${orgId} but getting error as The input was not valid

I am trying to generate a random eventid with orgId but getting this below error ,this error clearly states that input data to the event in invalid,when i change the event id to 1 ,code works fine ,only when i try to randomise it ,i am getting the below error message,but as shown in logs orgId is 29 then why Gatling not accepting that in post body

14:59:36.475 [WARN ] i.g.h.a.ResponseProcessor - Request 'CreateEventRound-GameKeeper' failed: status.find.in(200,201), but actually found 400
Session(Game Keeper Post Orgs ,1,Map(access_token -> eyJhbGciOiJSUzI1NiIsImtpZCI6IjM0NmM4YTY1NTBlZGI5MDRjM2IyNWI3ODlmOTllNjU3ODA4MGJiOTUiLCJ0eXAiOiJKV1QifQ.eyJhdWQiOiJpa3J3dWdoMzg3MWdodzhyZ243cTgzZ2giLCJleHAiOjE1NTU0NTI4NjgsImlhdCI6MTU1NTQ1MTk2OCwiaXNzIjoiNzZIRktZNzVHUkEyTFBHQ1pETVZYUTY2SEEiLCJzdWIiOiJZTUdDWFA2SVVCSE9QRkdLNDVYUUdON1RWNCIsIndvdGMtbmFtZSI6IktvemlsZWtzVHJhbnNsYXRvckRldiM1MjIxMyIsIndvdGMtZG9tbiI6InRhYmxldG9wIiwid290Yy1nYW1lIjoiZXZlbnRyZXBvcnRlcmRldiIsIndvdGMtZmxncyI6MCwid290Yy1yb2xzIjpbXSwid290Yy1wcm1zIjpbXSwid290Yy1zY3BzIjpbImZpcnN0LXBhcnR5Il19.SqMnINmD7q2FC1Zyf34xbaWOP3LhRtdbL44ZkY3vDKa2-E2yEv4fX1-f8dJTWzOVDNOJYLkHZCrKu8YkVqvO1u9RP5d-Kyfpm1GMVqV9duFPKOuRkgg6p8xxDy3jg0o-ItMZa3fYNNe-3GQ2BdGmxPv7fnoov-OSIY6F7XQAEdnGUc5uMxID_4BrKYZmpBDuzi3LPPaUJeHGdh_nOJvhq-sIUHFmIpp3e70VE9xLvjQ8uS8vJI1fGCq7tDvpXtFFtCPTQ05LLD_SIvt2uPULn80SHA8aH37cI0Zpu4eeDyy0sBjRSPXSK8vKEwhUDsbt_u02s-8O9BPeCJ4RLu8EfQ, gatling.http.cache.dns -> io.gatling.http.resolver.ShuffleJdkNameResolver@319ab5e5, gatling.http.cache.contentCache -> io.gatling.core.util.cache.Cache@619cf254, token_type -> Bearer, orgId -> 29, eventId -> ["The input was not valid.","The input was not valid."], 721cad9b-2343-46f4-8f2f-766319bc197b -> 8, e803e068-608b-4826-a7ab-7f7eff07fadb -> 0),1555451967893,23,KO,List(ExitOnCompleteLoopBlock(721cad9b-2343-46f4-8f2f-766319bc197b), ExitOnCompleteLoopBlock(e803e068-608b-4826-a7ab-7f7eff07fadb)),io.gatling.core.protocol.ProtocolComponentsRegistry$$Lambda$412/1842952737@70e2ec5d)
14:59:37.484 [WARN ] i.g.h.a.ResponseProcessor - Request 'CreateEventRound-GameKeeper' failed: status.find.in(200,201), but actually found 400
 Session(Game Keeper Post Orgs ,1,Map(access_token -> eyJhbGciOiJSUzI1NiIsImtpZCI6IjM0NmM4YTY1NTBlZGI5MDRjM2IyNWI3ODlmOTllNjU3ODA4MGJiOTUiLCJ0eXAiOiJKV1QifQ.eyJhdWQiOiJpa3J3dWdoMzg3MWdodzhyZ243cTgzZ2giLCJleHAiOjE1NTU0NTI4NjgsImlhdCI6MTU1NTQ1MTk2OCwiaXNzIjoiNzZIRktZNzVHUkEyTFBHQ1pETVZYUTY2SEEiLCJzdWIiOiJZTUdDWFA2SVVCSE9QRkdLNDVYUUdON1RWNCIsIndvdGMtbmFtZSI6IktvemlsZWtzVHJhbnNsYXRvckRldiM1MjIxMyIsIndvdGMtZG9tbiI6InRhYmxldG9wIiwid290Yy1nYW1lIjoiZXZlbnRyZXBvcnRlcmRldiIsIndvdGMtZmxncyI6MCwid290Yy1yb2xzIjpbXSwid290Yy1wcm1zIjpbXSwid290Yy1zY3BzIjpbImZpcnN0LXBhcnR5Il19.SqMnINmD7q2FC1Zyf34xbaWOP3LhRtdbL44ZkY3vDKa2-E2yEv4fX1-f8dJTWzOVDNOJYLkHZCrKu8YkVqvO1u9RP5d-Kyfpm1GMVqV9duFPKOuRkgg6p8xxDy3jg0o-ItMZa3fYNNe-3GQ2BdGmxPv7fnoov-OSIY6F7XQAEdnGUc5uMxID_4BrKYZmpBDuzi3LPPaUJeHGdh_nOJvhq-sIUHFmIpp3e70VE9xLvjQ8uS8vJI1fGCq7tDvpXtFFtCPTQ05LLD_SIvt2uPULn80SHA8aH37cI0Zpu4eeDyy0sBjRSPXSK8vKEwhUDsbt_u02s-8O9BPeCJ4RLu8EfQ, gatling.http.cache.dns -> io.gatling.http.resolver.ShuffleJdkNameResolver@319ab5e5, gatling.http.cache.contentCache -> io.gatling.core.util.cache.Cache@619cf254, token_type -> Bearer, orgId -> 30, eventId -> ["The input was not valid.","The input was not valid."], 721cad9b-2343-46f4-8f2f-766319bc197b -> 9, e803e068-608b-4826-a7ab-7f7eff07fadb -> 0),1555451967893,17,KO,List(ExitOnCompleteLoopBlock(721cad9b-2343-46f4-8f2f-766319bc197b), ExitOnCompleteLoopBlock(e803e068-608b-4826-a7ab-7f7eff07fadb)),io.gatling.core.protocol.ProtocolComponentsRegistry$$Lambda$412/1842952737@70e2ec5d)