I have installed odoo 12 on my server.When i am trying to login to it it shows the below error.After getting this error i installed reportlab of odoo 12 requirement version.still getting base and reportlab error.

2020-09-18 08:07:45,593 11004 INFO ? odoo: Odoo version 12.0
2020-09-18 08:07:45,594 11004 INFO ? odoo: addons paths: ['/home/ubuntu/.local/share/Odoo/addons/12.0', '/opt/odoo/odoo/odoo/addons', '/opt/odoo/odoo/addons']
2020-09-18 08:07:45,595 11004 INFO ? odoo: database: default@default:default
2020-09-18 08:07:45,678 11004 CRITICAL ? odoo.modules.module: Couldn't load module base
2020-09-18 08:07:45,678 11004 CRITICAL ? odoo.modules.module: No module named 'reportlab'
2020-09-18 08:07:45,679 11004 ERROR ? odoo.service.server: Failed to load server-wide module `base`.
Traceback (most recent call last):
  File "/opt/odoo/odoo/odoo/service/server.py", line 1109, in load_server_wide_modules
    odoo.modules.module.load_openerp_module(m)
  File "/opt/odoo/odoo/odoo/modules/module.py", line 368, in load_openerp_module
    __import__('odoo.addons.' + module_name)
  File "/opt/odoo/odoo/odoo/modules/module.py", line 82, in load_module
    exec(open(modfile, 'rb').read(), new_mod.__dict__)
  File "<string>", line 5, in <module>
  File "/opt/odoo/odoo/odoo/addons/base/models/__init__.py", line 12, in <module>
    from . import ir_actions_report
  File "/opt/odoo/odoo/odoo/addons/base/models/ir_actions_report.py", line 25, in <module>
    from reportlab.graphics.barcode import createBarcodeDrawing
ModuleNotFoundError: No module named 'reportlab'
Exception in thread odoo.service.httpd:
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/odoo/odoo/odoo/service/server.py", line 435, in http_thread
    self.httpd = ThreadedWSGIServerReloadable(self.interface, self.port, app)
  File "/opt/odoo/odoo/odoo/service/server.py", line 149, in __init__
    handler=RequestHandler)
  File "/usr/local/lib/python3.6/dist-packages/werkzeug/serving.py", line 699, in __init__
    HTTPServer.__init__(self, server_address, handler)
  File "/usr/lib/python3.6/socketserver.py", line 456, in __init__
    self.server_bind()
  File "/opt/odoo/odoo/odoo/service/server.py", line 164, in server_bind
    super(ThreadedWSGIServerReloadable, self).server_bind()
  File "/usr/lib/python3.6/http/server.py", line 136, in server_bind
    socketserver.TCPServer.server_bind(self)
  File "/usr/lib/python3.6/socketserver.py", line 470, in server_bind
    self.socket.bind(self.server_address)
OSError: [Errno 98] Address already in use

Exception in thread odoo.service.cron.cron0:
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/odoo/odoo/odoo/service/server.py", line 425, in target
    self.cron_thread(i)
  File "/opt/odoo/odoo/odoo/service/server.py", line 396, in cron_thread
    from odoo.addons.base.models.ir_cron import ir_cron
  File "/opt/odoo/odoo/odoo/addons/base/models/__init__.py", line 12, in <module>
    from . import ir_actions_report
  File "/opt/odoo/odoo/odoo/addons/base/models/ir_actions_report.py", line 25, in <module>
    from reportlab.graphics.barcode import createBarcodeDrawing
ModuleNotFoundError: No module named 'reportlab'

Exception in thread odoo.service.cron.cron1:
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/odoo/odoo/odoo/service/server.py", line 425, in target
    self.cron_thread(i)
  File "/opt/odoo/odoo/odoo/service/server.py", line 396, in cron_thread
    from odoo.addons.base.models.ir_cron import ir_cron
  File "/opt/odoo/odoo/odoo/addons/base/models/__init__.py", line 12, in <module>
    from . import ir_actions_report
  File "/opt/odoo/odoo/odoo/addons/base/models/ir_actions_report.py", line 25, in <module>
    from reportlab.graphics.barcode import createBarcodeDrawing
ModuleNotFoundError: No module named 'reportlab'