TCPDF unable to output file by saving. Path on Mac?

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I checked some similar questions here, but i didn't got an answer, solving my problem.

I use TCPDF to generate a PDF with PHP.

When I use the $pdf->Output($file_total, 'I'); it's all good and the file is shown in Browser.

If I use the save to localhost option $pdf->Output($file_total, 'F'); I get this error:

"failed to open stream: Permission denied in /opt/lampp/htdocs/project/tcpdf_min/include/tcpdf_static.php on line 1821" "TCPDF ERROR: Unable to create output file"

The Path I set for saving the PDF file is: "/opt/lampp/htdocs/project/files/2021"

What am I doing wrong? is my path wrong?

The forced saving $pdf->Output($file_total, 'D'); works just fine, so i must doing something wrong with the path on mac... please help!

Thanks



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