[SOLVED] Cash on delivery JSON Error

Hello everyone, I wanted to add to my store the "cash on delivery" option and I get an error message , regarding JSON something, when I try to check out.
I'm including screenshot because it does not let me copy the message....The strange thing is that the order looks completed, I mean I do get an e-mail notification for a new order...although I get this error message...

Thank you in advance.....novice here...

I'm using OC 3.0.3.8
default theme
PHP: 7.3.13
Chrome Browser...I tried incognito also with no luck....

extension problem.

Look in both the PHP and OpenCart error logs for the full error messages. If it's a live store you don't want error display on at all.

Looks to be an issue in the file apimodule.php which will have been added by an extension.

I think I found something, I had to disable some events from extensions tab named:
" API module router" following by a number , the description of the event was :
Trigger

catalog/controller/module/apimodule/orderstatuses/before

Action

extension/module/apimodule/routerIndex

Now the error message is gone and the order passes to success page.
I was looking at different payment methods, I've installed revolut gateway extension but did not used it, it might left traces, I don't know. I see how it goes...