I have tried to dig in the forums to solve this issue with invoices download giving this type of error, but all the solutions suggested seem not to work in my website. you can try registering on an event like this http://www.d3d.it/events/?ee=10 and in the registration mail when clicking the invoice link it will give this error . tested with firefox and explorer and it gives always the same error. it should be not a so big issue cause my events are always calibrated for a small amount of people and i can create invoices manually, but of course it would be better and more professional to have invoices automatically generated (or otherwise have the possibility to change the registration mail to get rid of the not working link, maybe replacing it with some own message saying i will send the invoice)
Generally that sort of error appears when there is a space at the top of a php file
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