Hi, sorry for the inconvenience. Are you using LightPDF? And we have contacted you via email. You can check it and send us a screenshot of the error message as well as the file you want to add a note to, we will test it and try our best figure out what is going on.
Hi, as I checked you bought LightPDF via this email: mar*****@g****.com successfully, so you just need to log in the website with that email and then you can start using the website. If you still have any question, you can contact us: firstname.lastname@example.org, we will help you there.