chapter 18: unable to push uaa application

getting the following error
cf logs uaa --recent

2018-09-14T18:57:34.34+0530 [STG/0] OUT Cell c16c82ae-cd4c-4c04-aec9-388a5f45fcf0 stopping instance e7052a23-4348-4eb7-a379-2137379fa5b4
2018-09-14T18:57:34.34+0530 [STG/0] OUT Cell c16c82ae-cd4c-4c04-aec9-388a5f45fcf0 destroying container for instance e7052a23-4348-4eb7-a379-2137379fa5b4
2018-09-14T18:57:34.78+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea creating container for instance 6eb45186-b14f-4203-7759-24e8
2018-09-14T18:57:34.79+0530 [CELL/0] ERR Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea failed to create container for instance 6eb45186-b14f-4203-7759-24e8: max containers reached
2018-09-14T18:57:34.82+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea destroying container for instance 6eb45186-b14f-4203-7759-24e8
2018-09-14T18:57:34.83+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea successfully destroyed container for instance 6eb45186-b14f-4203-7759-24e8
2018-09-14T18:57:34.83+0530 [API/7] OUT Process has crashed with type: "web"
2018-09-14T18:57:34.84+0530 [API/7] OUT App instance exited with guid c55dbecc-6ea2-4af1-b515-44a5cb7198c7 payload: {"instance"=>"6eb45186-b14f-4203-7759-24e8", "index"=>0, "cell_id"=>"732975b5-a95c-4e37-b595-a0a3c3a9e2ea", "reason"=>"CRASHED", "exit_description"=>"failed to create container: max containers reached", "crash_count"=>1, "crash_timestamp"=>1536931654802216815, "version"=>"8520a48b-8c3e-4f0a-9caa-db15f39e66a8"}
2018-09-14T18:57:35.01+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea creating container for instance ea10c288-7020-45d3-4f05-f04d
2018-09-14T18:57:35.01+0530 [CELL/0] ERR Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea failed to create container for instance ea10c288-7020-45d3-4f05-f04d: max containers reached
2018-09-14T18:57:35.05+0530 [API/2] OUT Process has crashed with type: "web"
2018-09-14T18:57:35.05+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea destroying container for instance ea10c288-7020-45d3-4f05-f04d
2018-09-14T18:57:35.05+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea successfully destroyed container for instance ea10c288-7020-45d3-4f05-f04d
2018-09-14T18:57:35.06+0530 [API/2] OUT App instance exited with guid c55dbecc-6ea2-4af1-b515-44a5cb7198c7 payload: {"instance"=>"ea10c288-7020-45d3-4f05-f04d", "index"=>0, "cell_id"=>"732975b5-a95c-4e37-b595-a0a3c3a9e2ea", "reason"=>"CRASHED", "exit_description"=>"failed to create container: max containers reached", "crash_count"=>2, "crash_timestamp"=>1536931655027245367, "version"=>"8520a48b-8c3e-4f0a-9caa-db15f39e66a8"}
2018-09-14T18:57:35.25+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea creating container for instance d766ae78-16a7-4cce-4471-cf4e
2018-09-14T18:57:35.26+0530 [CELL/0] ERR Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea failed to create container for instance d766ae78-16a7-4cce-4471-cf4e: max containers reached
2018-09-14T18:57:35.27+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea destroying container for instance d766ae78-16a7-4cce-4471-cf4e
2018-09-14T18:57:35.27+0530 [CELL/0] OUT Cell 732975b5-a95c-4e37-b595-a0a3c3a9e2ea successfully destroyed container for instance d766ae78-16a7-4cce-4471-cf4e
2018-09-14T18:57:35.29+0530 [API/17] OUT Process has crashed with type: "web"
2018-09-14T18:57:35.31+0530 [API/17] OUT App instance exited with guid c55dbecc-6ea2-4af1-b515-44a5cb7198c7 payload: {"instance"=>"d766ae78-16a7-4cce-4471-cf4e", "index"=>0, "cell_id"=>"732975b5-a95c-4e37-b595-a0a3c3a9e2ea", "reason"=>"CRASHED", "exit_description"=>"failed to create container: max containers reached", "crash_count"=>3, "crash_timestamp"=>1536931655269287366, "version"=>"8520a48b-8c3e-4f0a-9caa-db15f39e66a8"}
2018-09-14T18:57:37.59+0530 [STG/0] OUT Cell c16c82ae-cd4c-4c04-aec9-388a5f45fcf0 successfully destroyed container for instance e7052a23-4348-4eb7-a379-2137379fa5b4