Your screenshot shows that you create each PDF files in a Service.If that Service executes from a client process (something which I can't tell from the screenshot ...), that could certainly explain the error, because that would mean your Binary data (the PDFs) is sent from server to client and then back again to the server (Concatenate PDF is implemented only on the server).Apart from the fact that for any data this kind of modelling is inefficient, when it comes to Binary data it simply won't work, since the client cannot handle Binary data (with the single exception of File Input Field which can be only be used to upload files from the client).
If this is indeed the case you'll meed to change your model so that both Convert to PDF and Concatenate PDF execute in the same server call.
If my assumptions regarding your model are incorrect, please look for (and post) more details in tersus.log - look for the error message appearing in the first screenshot, and the stack dump that should appear following ir You're also welcome to attach a project demonstrating the issue.
Regards,
David
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