Error installing ERPNext in 2nd site

Hi,
I am getting below error when trying to install ERPNext in 2ns website to give demo of School Features. Fleet Management is installed in default site and working perfect. DNS Tenancy is enabled.

itwork@ERP:~$ bench --site school.itwork.co install-app erpnext
Installing erpnext…
Updating erpnext : [=========== ]Module import failed for Vehicle Service (fleet_management.fleet_management.doctype.vehicle_service.vehicle_service)
Traceback (most recent call last):
File “/usr/lib/python2.7/runpy.py”, line 162, in _run_module_as_main
main”, fname, loader, pkg_name)
File “/usr/lib/python2.7/runpy.py”, line 72, in _run_code
exec code in run_globals
File “/home/itwork/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 79, in
main()
File “/home/itwork/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 16, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/itwork/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 716, in call
return self.main(*args, **kwargs)
File “/home/itwork/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 696, in main
rv = self.invoke(ctx)
File “/home/itwork/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1060, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/itwork/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1060, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/itwork/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 889, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/itwork/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 534, in invoke
return callback(*args, **kwargs)
File “/home/itwork/frappe-bench/env/local/lib/python2.7/site-packages/click/decorators.py”, line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/itwork/frappe-bench/apps/frappe/frappe/commands/init.py”, line 24, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/itwork/frappe-bench/apps/frappe/frappe/commands/site.py”, line 152, in install_app
_install_app(app, verbose=context.verbose)
File “/home/itwork/frappe-bench/apps/frappe/frappe/installer.py”, line 132, in install_app
sync_for(name, force=True, sync_everything=True, verbose=verbose)
File “/home/itwork/frappe-bench/apps/frappe/frappe/model/sync.py”, line 44, in sync_for
import_file_by_path(doc_path, force=force)
File “/home/itwork/frappe-bench/apps/frappe/frappe/modules/import_file.py”, line 54, in import_file_by_path
import_doc(doc, force=force, data_import=data_import, pre_process=pre_process)
File “/home/itwork/frappe-bench/apps/frappe/frappe/modules/import_file.py”, line 122, in import_doc
doc.insert()
File “/home/itwork/frappe-bench/apps/frappe/frappe/model/document.py”, line 222, in insert
self.run_post_save_methods()
File “/home/itwork/frappe-bench/apps/frappe/frappe/model/document.py”, line 771, in run_post_save_methods
self.run_method(“on_update”)
File “/home/itwork/frappe-bench/apps/frappe/frappe/model/document.py”, line 654, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/itwork/frappe-bench/apps/frappe/frappe/model/document.py”, line 882, in composer
return composed(self, method, *args, **kwargs)
File “/home/itwork/frappe-bench/apps/frappe/frappe/model/document.py”, line 865, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/itwork/frappe-bench/apps/frappe/frappe/model/document.py”, line 648, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/itwork/frappe-bench/apps/frappe/frappe/core/doctype/doctype/doctype.py”, line 154, in on_update
self.run_module_method(“on_doctype_update”)
File “/home/itwork/frappe-bench/apps/frappe/frappe/core/doctype/doctype/doctype.py”, line 163, in run_module_method
module = load_doctype_module(self.name, self.module)
File “/home/itwork/frappe-bench/apps/frappe/frappe/modules/utils.py”, line 171, in load_doctype_module
doctype_python_modules[key] = frappe.get_module(module_name)
File “/home/itwork/frappe-bench/apps/frappe/frappe/init.py”, line 654, in get_module
return importlib.import_module(modulename)
File “/usr/lib/python2.7/importlib/init.py”, line 37, in import_module
import(name)
ImportError: No module named vehicle_service.vehicle_service

Can anybody help please?

Try bench update before installing erpnext to your site