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I am having this problem as well. We assign 6 slots to a ticket, one ticket sales and the system says there is only 4 spaces available.
Has this not been resolved yet?
Many thanks, Ana

Hi Sami,
Thank you for your response.
I am using woocommerce. Everything worked fine until it didn’t…
The only way I have managed to fix the error is to leave the plain permalinks, but that’s not a good solution, as the cache plugin won’t work if I don’t have pretty permalinks. ??
Many thanks, Ana

I noticed that the only way to fix this was to turn the pretty permalinks off. This isn’t a good solution, as my caching plugin won’t work unless they are turned on.
Any ideas would be much appreciated.
Thanks

Hi Chris,
Thank you for the reply. I disactivated the rest of the plugins that I had installed and found that when one of them was active (Wp-commerce) then the voucher would be generated ok.
SO I assume this is what’s causing the problem. Now I have no idea how to fix it.

When I open the PDF that doesn’t work in notepad I get this message, and there are a couple of empty spaces above the message.

TCPDF ERROR: Some data has already been output, can’t send PDF file

Many thanks for your help.
Ana