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I install an old version of wp pdf stamper and all is working fine.
I think the problem come from the latest version.
I try to resinstall the plugin but I still got the same error.
Have you another idea ?
Thank you very much,
Thank you for your answer.
I had already the 4.0.9 to make the test.
The visitor are recorded but still not the transaction.
Is there the possibility to use another analytics plugin ?