Yes, the problem is that the pdf does not exist and according to the path, the reason might be a wrong invoice number or invoice number prefix. Which invoice number and invoice number prefix is set in the company settings?
The invoice number prefix may conatin chars a-z, numbers 0-9, - and _. It may not contain any other signs like slashes, backslahes etc.
To get support for the billing module, please contact us by email. This thread here is just for general questions about the plugin.
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