Issue: When attempting to create a 3rd party form (or open a file that relies on a folder path in Probate Plus system settings) the following dialog box appears showing I/O error 123.
This is a Windows error and normally triggered when trying to access a non existent folder location or where user may have insufficient permissions.
ERROR_INVALID_NAME
123 (0x7B)
The filename, directory name, or volume label syntax is incorrect.
(source - System Error Codes (0-499) (WinError.h) - Win32 apps | Microsoft Learn )
Resolution: Double check that the forms and documents file paths are pointing at valid folder locations under "FILE..Options..Configure System..File locations". You should test the ability for user to open a file path location via Windows Explorer before applying the location into Probate Plus settings.
See also: Installing the Form Filling feature add-on (PPv5) – Probate Plus support