i have installed successfully without errors

startup server is not working and it stops at 

Q0KQJK2A  - Successfully started service [VBD.Default] in client mode 2021-06-03 12:18:13,232 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251'] Starting execution of upgrade job. 2021-06-03 12:18:13,239 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251'] Detected fresh start or upgrade. 2021-06-03 12:18:13,390 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251-1'] Upgrade task 'Migration type resolver' is not available to start. 2021-06-03 12:18:13,390 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251-2'] Upgrade task 'Publish Default Data Model' is not available to start. 2021-06-03 12:18:13,390 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251-3'] Upgrade task 'Generate missing CSP records' is not available to start. 2021-06-03 12:18:13,390 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251-4'] Upgrade task 'Pega-Search-Install.pzSearchInstall' started. 2021-06-03 12:18:13,611 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (all.Pega_Search_Install.Action) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - Performing Search Installation 2021-06-03 12:18:16,283 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251-4'] Upgrade task 'Pega-Search-Install.pzSearchInstall' finished with status 'true' 2021-06-03 12:18:16,283 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251-5'] Upgrade task 'Reindex platform Rule and Other Data instances' is not available to start. 2021-06-03 12:18:16,283 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251-6'] Upgrade task 'Reindex all classes in the application model' is not available to start. 2021-06-03 12:18:16,508 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (.upgrade.JobInfrastructureImpl) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade] Job 'UPGRADE' deactivated. 2021-06-03 12:18:16,508 [OBSCHEDULER_THREAD_4] [  STANDARD] [                    ] [                    ] (tructure.upgrade.UpgradeAction) INFO   B1QGNHUKQW33E5YEYOGDSME787M5ZYD36A  - [Indexer][Upgrade][Track: '851f7251'] Finished execution of all tasks for upgrade job. 2021-06-03 12:19:16,584 [low.Default-Pulse:24] [  STANDARD] [                    ] [                    ] (ice.auxpulse.AuxiliaryListener) INFO     - Starting task [PersistMetricsTask] since this node became the auxiliary data flow node

when i tried to open the login page

it shows this: 

It looks like the webpage at http://localhost:8080/prweb/PRServlet might be having issues, or it may have moved permanently to a new web address.

please help and find the attachment log