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Pdf outputs weird characters

Question:

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When I try to export a table or recordset to PDF file, the file contains weird characters.

What is causing this?

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Exported File is Empty or Database Error Appears

Question:

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When I try to export a recordset to a PDF file, the file appears empty or throws an error.

"FPDF error: Some data has already been output, can't send the PDF file".

The following error is displayed in the CSV, XML or Excel formats:

"Warning:  mysql_num_fields(): 7 is not a valid MySQL result resource in dmxDataExporter.php on line 1159"

instead of the data. What have I done wrong?

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