Print Format Error

[tonspar]

Description of the issue

Hello,
unfortunately, I can not add custom "Print Format". As standard user I got error during saving from /app/print-format-builder/

frappe.exceptions.DoesNotExistError: DocType None not found

As an Adminstrator I got this error:

File "apps/frappe/frappe/model/document.py", line 75, in get_doc
    raise ValueError("First non keyword argument must be a string or dict")
ValueError: First non keyword argument must be a string or dict

If I try system console for inserting I got this error:

Traceback (most recent call last):
  File "apps/frappe/frappe/desk/doctype/system_console/system_console.py", line 32, in run
    safe_exec(self.console, script_filename="System Console")
  File "apps/frappe/frappe/utils/safe_exec.py", line 100, in safe_exec
    exec(
  File "<serverscript>: system_console", line 4, in <module>
  File "apps/frappe/frappe/model/document.py", line 292, in insert
    self._validate()
  File "apps/frappe/frappe/model/document.py", line 574, in _validate
    self._validate_mandatory()
  File "apps/frappe/frappe/model/document.py", line 911, in _validate_mandatory
    raise frappe.MandatoryError(
frappe.exceptions.MandatoryError: [Print Format, 6c2664e7ca]: parent, parenttype

The last weird thing is "Print Format" form view, it is almost blank:

We are running on the frappecloud.

App versions:

ERPNext: v15.20.3 (HEAD)

Frappe Framework: v15.22.0 (HEAD)

Frappe HR: v15.17.0 (HEAD)

Payments: v0.0.1 (HEAD)

I have tried update apps and site and migrate, nothing helped :-(

Thank you.

Jiri Sir

[tonspar]

Finally, I have found the issue.
System let me customize "Print Format" Form. I remember I wanted allow "Allow Import". I check the checkbox and press "Save".
It is weird but it was visible and in function, because it generated these property setters:

that screw up the form view and the other functions.