Error on creating new site on v7 - Module import failed for Newsletter

I have had no issues in the past when creating a new site on, however I tried to add another site I got the below error when I tried to install the ERPNEXT on the newly created site, any ideas?

frappe@erp:~/frappe-bench$ bench --site mythirdsite install-app erpnext
Installing erpnext…
Updating erpnext : [======== ]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/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 79, in
main()
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 16, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 716, in call
return self.main(*args, **kwargs)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 696, in main
rv = self.invoke(ctx)
File “/home/frappe/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/frappe/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/frappe/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/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 534, in invoke
return callback(*args, **kwargs)
File “/home/frappe/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/frappe/frappe-bench/apps/frappe/frappe/commands/init.py”, line 24, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/site.py”, line 152, in install_app
_install_app(app, verbose=context.verbose)
File “/home/frappe/frappe-bench/apps/frappe/frappe/installer.py”, line 132, in install_app
sync_for(name, force=True, sync_everything=True, verbose=verbose)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/sync.py”, line 44, in sync_for
import_file_by_path(doc_path, force=force)
File “/home/frappe/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/frappe/frappe-bench/apps/frappe/frappe/modules/import_file.py”, line 122, in import_doc
doc.insert()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 212, in insert
self.run_post_save_methods()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 768, in run_post_save_methods
self.run_method(“on_update”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 651, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 858, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 841, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 645, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/core/doctype/doctype/doctype.py”, line 186, in on_update
self.run_module_method(“on_doctype_update”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/core/doctype/doctype/doctype.py”, line 195, in run_module_method
module = load_doctype_module(self.name, self.module)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/utils.py”, line 173, in load_doctype_module
raise ImportError, ‘Module import failed for {0} ({1})’.format(doctype, module_name)
ImportError: Module import failed for Newsletter (erpnext.crm.doctype.newsletter.newsletter)
frappe@erp:~/frappe-bench$

… I am using version 7, and do not want to upgrade to the higher version.

I would appreciate your help