Mailgun Error (Traceback included) SMTPAuthenticationError(535, '5.7.0 Mailgun is not loving your login or password'),)

Traceback (most recent call last):
File “/home/milestro/frappe-bench/apps/frappe/frappe/desk/form/save.py”, line 22, in savedocs
doc.save()
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 260, in save
return self._save(*args, **kwargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 313, in _save
self.run_post_save_methods()
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 905, in run_post_save_methods
self.run_method(“on_update”)
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 772, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 1048, in composer
return composed(self, method, *args, **kwargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 1031, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 766, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/email/doctype/email_domain/email_domain.py”, line 79, in on_update
frappe.throw(e)
File “/home/milestro/frappe-bench/apps/frappe/frappe/init.py”, line 356, in throw
msgprint(msg, raise_exception=exc, title=title, indicator=‘red’)
File “/home/milestro/frappe-bench/apps/frappe/frappe/init.py”, line 341, in msgprint
message_log.append(json.dumps(out))
File “/usr/lib/python2.7/json/init.py”, line 244, in dumps
return _default_encoder.encode(obj)
File “/usr/lib/python2.7/json/encoder.py”, line 207, in encode
chunks = self.iterencode(o, _one_shot=True)
File “/usr/lib/python2.7/json/encoder.py”, line 270, in iterencode
return _iterencode(o, 0)
File “/usr/lib/python2.7/json/encoder.py”, line 184, in default
raise TypeError(repr(o) + " is not JSON serializable")
TypeError: ValidationError(SMTPAuthenticationError(535, ‘5.7.0 Mailgun is not loving your login or password’),) is not JSON serializable

Traceback (most recent call last):
File “/home/milestro/frappe-bench/apps/frappe/frappe/app.py”, line 61, in application
response = frappe.handler.handle()
File “/home/milestro/frappe-bench/apps/frappe/frappe/handler.py”, line 21, in handle
data = execute_cmd(cmd)
File “/home/milestro/frappe-bench/apps/frappe/frappe/handler.py”, line 56, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “/home/milestro/frappe-bench/apps/frappe/frappe/init.py”, line 1032, in call
return fn(*args, **newargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/desk/form/save.py”, line 22, in savedocs
doc.save()
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 260, in save
return self._save(*args, **kwargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 313, in _save
self.run_post_save_methods()
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 905, in run_post_save_methods
self.run_method(“on_update”)
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 772, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 1048, in composer
return composed(self, method, *args, **kwargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 1031, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/milestro/frappe-bench/apps/frappe/frappe/model/document.py”, line 766, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/milestro/frappe-bench/apps/frappe/frappe/email/doctype/email_domain/email_domain.py”, line 79, in on_update
frappe.throw(e)
File “/home/milestro/frappe-bench/apps/frappe/frappe/init.py”, line 356, in throw
msgprint(msg, raise_exception=exc, title=title, indicator=‘red’)
File “/home/milestro/frappe-bench/apps/frappe/frappe/init.py”, line 341, in msgprint
message_log.append(json.dumps(out))
File “/usr/lib/python2.7/json/init.py”, line 244, in dumps
return _default_encoder.encode(obj)
File “/usr/lib/python2.7/json/encoder.py”, line 207, in encode
chunks = self.iterencode(o, _one_shot=True)
File “/usr/lib/python2.7/json/encoder.py”, line 270, in iterencode
return _iterencode(o, 0)
File “/usr/lib/python2.7/json/encoder.py”, line 184, in default
raise TypeError(repr(o) + " is not JSON serializable")
TypeError: ValidationError(SMTPAuthenticationError(535, ‘5.7.0 Mailgun is not loving your login or password’),) is not JSON serializable