Recently updated to AcyMailing 9.51 and saw this error message trying to create an Email Archive Menu link.
An error has occurred.
Class "acym_JFormFiled" not found.
Joomla 4.43
PHP 8.127
Note: I am migrating from Joomla 3 to 4 and I ended up having to reinstall 9.51 after the migration as the modules were also throwing a similar error. The reinstallation in J4 solved the module error messages.
SQL 5.744
