Hello together,

Today i had an issue when i tried to generate the report on the RPE web.
I have installed RPE version 2.1 and deployed it on tomcat 8.5.5
and after running it on the web and try to generate a sample on this web page it cashed a error as bellow
05-10-2016T15:01:40:383+0700 [http-nio-8080-exec-8] DGaaS license checked-out successfully for vti1hc.
05-10-2016T15:02:33:395+0700 [http-nio-8080-exec-8] CRRPE2039I Downloading file http://localhost:8080/rpeng/api/templates/401?action=download to C:\My data\working\tomcat\temp\RPE\temp\url_01cad712-32e4-48a1-9be1-491165c62adb.tmp.
05-10-2016T15:03:00:962+0700 [http-nio-8080-exec-5] CRRPE2039I Downloading file http://localhost:8080/rpeng/api/templates/401?action=download to C:\My data\working\tomcat\temp\RPE\temp\url_ff19f715-a884-4074-b66f-00e2fc450602.tmp.
05-10-2016T15:03:01:070+0700 [http-nio-8080-exec-5] Creating a new resource for http://localhost:8080/rpeng/api/dgaas/jobs
05-10-2016T15:03:01:074+0700 [http-nio-8080-exec-5] Creating a new resource for http://localhost:8080/rpeng/api/dgaas/files
05-10-2016T15:03:01:078+0700 [http-nio-8080-exec-5] DGaaS concurrent limit set at 10
05-10-2016T15:03:01:104+0700 [http-nio-8080-exec-5] Document generation 427B4D03-9BF6-4986-83ED-C55DAE48B144 queued.
05-10-2016T15:03:01:105+0700 [http-nio-8080-exec-5] Document generation 427B4D03-9BF6-4986-83ED-C55DAE48B144 started.
05-10-2016T15:03:01:115+0700 [http-nio-8080-exec-5] CRRPE3126I Setting a warning on pool PS Old Gen for memory usage more than 307 MB (90% of the maximum allowed heap size). If the heap size grows over this limit a warning message will be logged.
05-10-2016T15:03:01:163+0700 [RRDG_37:51-CORE] DGaaS license checkout failed. Number of tries left: 4
05-10-2016T15:03:06:171+0700 [RRDG_37:51-CORE] DGaaS license checkout failed. Number of tries left: 3
05-10-2016T15:03:11:178+0700 [RRDG_37:51-CORE] DGaaS license checkout failed. Number of tries left: 2
05-10-2016T15:03:16:185+0700 [RRDG_37:51-CORE] DGaaS license checkout failed. Number of tries left: 1
05-10-2016T15:03:21:192+0700 [RRDG_37:51-CORE] CRRPE3010E The license could not be verified.
Licensed number of users already reached.
Feature:       RPE_PUBLISH
License path:  27000@localhost;
FLEXnet Licensing error:-4,132
For further information, refer to the FLEXnet Licensing documentation,
available at "www.flexerasoftware.com".
05-10-2016T15:03:21:215+0700 [DGAAS_JOB_MONITOR] Document generation 427B4D03-9BF6-4986-83ED-C55DAE48B144 finished.
05-10-2016T15:06:39:647+0700 [http-nio-8080-exec-2] DGaaS license checked-in successfully.
05-10-2016T16:55:45:204+0700 [http-nio-8080-exec-3] DGaaS license checked-out successfully for vti1hc.
05-10-2016T16:57:02:335+0700 [http-nio-8080-exec-5] CRRPE2039I Downloading file http://localhost:8080/rpeng/api/templates/20?action=download to C:\My data\working\tomcat\temp\RPE\temp\url_9af3a26c-dbca-41f5-b592-a1b0025fb4b7.tmp.
05-10-2016T16:57:22:830+0700 [http-nio-8080-exec-5] CRRPE2039I Downloading file http://localhost:8080/rpeng/api/templates/20?action=download to C:\My data\working\tomcat\temp\RPE\temp\url_86eb4a25-2c61-41bc-ac61-8cf04f872411.tmp.
05-10-2016T16:57:23:230+0700 [http-nio-8080-exec-5] Document generation 2EFF0BDD-3EB3-4823-9C8B-6B4FC420B9C7 queued.
05-10-2016T16:57:23:657+0700 [http-nio-8080-exec-5] Document generation 2EFF0BDD-3EB3-4823-9C8B-6B4FC420B9C7 started.
05-10-2016T16:57:23:685+0700 [RRDG_37:58-CORE] DGaaS license checkout failed. Number of tries left: 4
05-10-2016T16:57:28:692+0700 [RRDG_37:58-CORE] DGaaS license checkout failed. Number of tries left: 3
05-10-2016T16:57:33:700+0700 [RRDG_37:58-CORE] DGaaS license checkout failed. Number of tries left: 2
05-10-2016T16:57:38:707+0700 [RRDG_37:58-CORE] DGaaS license checkout failed. Number of tries left: 1
05-10-2016T16:57:43:714+0700 [RRDG_37:58-CORE] CRRPE3010E The license could not be verified.
Licensed number of users already reached.
Feature:       RPE_PUBLISH
License path:  27000@localhost;
FLEXnet Licensing error:-4,132
For further information, refer to the FLEXnet Licensing documentation,
available at "www.flexerasoftware.com".
05-10-2016T16:57:43:728+0700 [DGAAS_JOB_MONITOR] Document generation 2EFF0BDD-3EB3-4823-9C8B-6B4FC420B9C7 finished.

Please help me to clear about this issue.
I have installed an configured as the link bellow guide
http://www.ibm.com/support/knowledgecenter/SS6RHZ_2.1.0/com.ibm.rational.pe.install.doc/topics/t_rpeng_tomcat.html
many thanks!
Tinhvo