while installing the odoo 14 application in odoo 15 i received the error

AttributeError: module 'odoo.addons.web.controllers.main' has no attribute 'jinja2'

details below 

Traceback (most recent call last):
  File "/cloudclusters/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/cloudclusters/odoo/odoo/http.py", line 687, in dispatch
    result = self._call_function(**self.params)
  File "/cloudclusters/odoo/odoo/http.py", line 359, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/cloudclusters/odoo/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/cloudclusters/odoo/odoo/http.py", line 348, in checked_call
    result = self.endpoint(*a, **kw)
  File "/cloudclusters/odoo/odoo/http.py", line 916, in __call__
    return self.method(*args, **kw)
  File "/cloudclusters/odoo/odoo/http.py", line 535, in response_wrap
    response = f(*args, **kw)
  File "/cloudclusters/odoo/odoo/addons/web/controllers/main.py", line 1339, in call_button
    action = self._call_kw(model, method, args, kwargs)
  File "/cloudclusters/odoo/odoo/addons/web/controllers/main.py", line 1327, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/cloudclusters/odoo/odoo/api.py", line 464, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/cloudclusters/odoo/odoo/api.py", line 451, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "", line 2, in button_immediate_install
  File "/cloudclusters/odoo/odoo/addons/base/models/ir_module.py", line 74, in check_and_log
    return method(self, *args, **kwargs)
  File "/cloudclusters/odoo/odoo/addons/base/models/ir_module.py", line 483, in button_immediate_install
    return self._button_immediate_function(type(self).button_install)
  File "/cloudclusters/odoo/odoo/addons/base/models/ir_module.py", line 600, in _button_immediate_function
    registry = modules.registry.Registry.new(self._cr.dbname, update_module=True)
  File "/cloudclusters/odoo/odoo/modules/registry.py", line 87, in new
    odoo.modules.load_modules(registry, force_demo, status, update_module)
  File "/cloudclusters/odoo/odoo/modules/loading.py", line 476, in load_modules
    loaded_modules, update_module, models_to_check)
  File "/cloudclusters/odoo/odoo/modules/loading.py", line 365, in load_marked_modules
    perform_checks=perform_checks, models_to_check=models_to_check
  File "/cloudclusters/odoo/odoo/modules/loading.py", line 179, in load_module_graph
    load_openerp_module(package.name)
  File "/cloudclusters/odoo/odoo/modules/module.py", line 396, in load_openerp_module
    __import__('odoo.addons.' + module_name)
  File "/cloudclusters/odoo/odoo/addons/eyeclinic_singledoc/__init__.py", line 3, in 
    from . import controllers
  File "/cloudclusters/odoo/odoo/addons/eyeclinic_singledoc/controllers/__init__.py", line 3, in 
    from . import controllers
  File "/cloudclusters/odoo/odoo/addons/eyeclinic_singledoc/controllers/controllers.py", line 49, in 
    env = main.jinja2.Environment(loader=loader, autoescape=True)
Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/cloudclusters/odoo/odoo/http.py", line 643, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/cloudclusters/odoo/odoo/http.py", line 301, in _handle_exception
    raise exception.with_traceback(None) from new_cause
AttributeError: module 'odoo.addons.web.controllers.main' has no attribute 'jinja2'