Newbie at this webdev experience, please be gentle.
Operating on Wamp Server, with PhP 7.4. This is a new install of Joomla 3.9.22 (upgraded)
Installed OSCCK 6.7 Lite and got error when attempting to add entities.
Admin > OS CCK > Entities > Add > Select Entity Type, I get the error message upon selecting either option. See the Attached Image
Thanks in advance for your assistance.

Hello

Thank you for report,
We will check this at Monday

But you continue may use our Joomla CCK component.
This not error, this notice, You may turn off show they.
Please in joomla admin menu: System->"global configuration""->Server: "Error Reporting" - turn to "Default" or "none"

Regards
OrdaSoft team

Please download our last version of Joomla CCk and check again

Regards
OrdaSoft team

Thank you for your patience and most important your resolution.
I followed your instructions and it resolved the problem.
BTW, I plan to purchase "Pro" but want to check out "Lite" first. I want to make sure that I can use it (I purchased some software a few years ago and it was too advance for me, still have not been able to use it). Can you recommend where I may find additional tutorials about structured content?

Hello

In our Joomla CCK You see documentation tab.

Most important :
any type of your content:
- You need create Entity - what about your site (Book, car, house ...)
- You need create "add layout", form where you or your customers will add your content
- You need create "Show layout" where your clients will see your content
This most important what you need do.
Next reread documentation for Our Website builder
and after you may create all another layouts.
Or check our free packages with OS CCK

And most important: Please write to us if you will have some questions

Regards
OrdaSoft team

Thank you for your response. As previously indicated I am new at this and you have been very gracious in your support. I don't know how to close this but for all who may read this post. The issue has been resolved!!!