Dumping the demo data results in error

Hi,
I am trying to use openmaint and successfully executed the docker-compose file located in openmaint-2.0-3.2.1 directory.
The demo data is launched successfully, but when i try to drop the demo data using the command given below and change the CMDBUILD_DUMP=my_db and relaunch the container as guided here (https://github.com/itmicus/cmdbuild_docker#how-drop-cmdbuild-database)
After relaunching the container, i get a screen with lot of patches on it and when i press the patch button, it simply gives a generic error and get stuck on that screen like this
Any help regarding how to link a new db after dumping the demo would be highly appreciated.