Tried to update a site to eCart6 getting an error

I am getting the following error message

Warning: Missing argument 13 for LTACconvention_Definition::LTACconvention_Definition(), called in /home/ltacorg/public_html/WA_eCart/LTACconvention_PHP.php on line 486 and defined in /home/ltacorg/public_html/WA_eCart/LTACconvention_PHP.php on line 4

I opened the LTACconvention_PHP.php file, looked at line 486 which starts the list of column and calculation definitions. I changed/added the ones that had been updated/added/removed, but it didn't change the error message at all.

The page is up at https://ltac.org/convention/registration.php

I have attached LTACconvention_PHP.php

to use an eCart object that was created with eCart 5 in eCart 6, you need to open the eCart object window:
Window -> eCart -> eCart object

select the eCart object from the list and click the edit icon to open the eCart object editor, and then click OK to have the eCart object regenerated for eCart 6.

I created a new cart object with additional fields, and then tried to update the existing dynamic product detail page which had the dynamic add to cart (registration form) included already. I had to update a few fields, but thought that would be faster than starting from scratch. on the page with my dATC, I deleted the old cart object, and then added the new cart object via server behaviors/eCart/eCart Object

Not sure where to go from here. have I just made a mess by trying to save time?

I dont follow.

What is the exact problem?

You describe the steps you took, but do not mention what the outcome is.

I need more details in order to know what the problem is.