Permissions error after git pull

So I make an app, make doctypes, edit. Then I push to git, my friend downloads locally, works on it, then pushes it up, then I GIT pull, then I get a permission error and have to do sudo git pull.

I think everything is ok, but then I can not change doctypes.

and get this error:
Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/app.py”, line 57, in application
response = frappe.handler.handle()
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 22, in handle
data = execute_cmd(cmd)
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 53, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 922, in call
return fn(*args, **newargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/save.py”, line 22, in savedocs
doc.save()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 230, in save
return self._save(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 280, in _save
self.run_post_save_methods()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 790, in run_post_save_methods
self.run_method(“on_update”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 666, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 887, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 870, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 660, 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 212, in on_update
self.export_doc()
File “/home/frappe/frappe-bench/apps/frappe/frappe/core/doctype/doctype/doctype.py”, line 324, in export_doc
export_to_files(record_list=[[‘DocType’, self.name]])
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/export_file.py”, line 22, in export_to_files
write_document_file(frappe.get_doc(record[0], record[1]), record_module, create_init=create_init)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/export_file.py”, line 43, in write_document_file
with open(os.path.join(folder, fname +“.json”),‘w+’) as txtfile:
IOError: [Errno 13] Permission denied: u’/home/frappe/frappe-bench/apps/swimventory/swimventory/swimventory/doctype/fish_transfer_request/fish_transfer_request.json’

Any ideas?