Please first check to see if the “Require login for all events?” option Event Espresso > Member Settings options is set to Yes or No.
The FPDF error might be a server setting where it’s not allowing the image file to be opened. Here’s a link to a similar report where the issue was fixed by changing a setting on the server:
The support post ‘Various Issues with EE3’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.