Value Error Null Strings

I keep getting this error every few days i couldn’t find any solution for it, i manage to get the app to work by completely deleting my docker images (Djnago and the Database). how can i solve this error and is causes it.

Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
File "/usr/local/lib/python3.10/", line 1016, in _bootstrap_inner
File "/usr/local/lib/python3.10/", line 953, in run
self._target(*self._args, **self._kwargs)
File "/usr/local/lib/python3.10/site-packages/django/utils/", line 64, in wrapper
fn(*args, **kwargs)
File "/usr/local/lib/python3.10/site-packages/django/core/management/commands/", line 134, in inner_run
File "/usr/local/lib/python3.10/site-packages/django/core/management/", line 475, in check
all_issues = checks.run_checks(
File "/usr/local/lib/python3.10/site-packages/django/core/checks/", line 88, in run_checks
new_errors = check(app_configs=app_configs, databases=databases)
File "/usr/local/lib/python3.10/site-packages/django/core/checks/", line 14, in check_url_config
return check_resolver(resolver)
File "/usr/local/lib/python3.10/site-packages/django/core/checks/", line 24, in check_resolver
return check_method()
File "/usr/local/lib/python3.10/site-packages/django/urls/", line 494, in check
for pattern in self.url_patterns:
File "/usr/local/lib/python3.10/site-packages/django/utils/", line 57, in __get__
res = instance.__dict__[] = self.func(instance)
File "/usr/local/lib/python3.10/site-packages/django/urls/", line 715, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/usr/local/lib/python3.10/site-packages/django/utils/", line 57, in __get__
res = instance.__dict__[] = self.func(instance)
File "/usr/local/lib/python3.10/site-packages/django/urls/", line 708, in urlconf_module
return import_module(self.urlconf_name)
File "/usr/local/lib/python3.10/importlib/", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 879, in exec_module
File "<frozen importlib._bootstrap_external>", line 1017, in get_code
File "<frozen importlib._bootstrap_external>", line 947, in source_to_code
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
ValueError: source code string cannot contain null bytes

I figured it out, the url file was corrupted i had to rewrite it again and it worked, but what would cause the file to corrupt.